Running choco pack on Mono on Linux will not include any files in .nupkg if there is no files element in the .nuspec

[TheCakeIsNaOH]

What You Are Seeing?

On Mono on Linux.

If there is no <files> element in the .nuspec, then when running choco pack, no files apart from the .nuspec will be included in the .nupkg.

What is Expected?

On Windows, when running choco pack when the .nuspec has no <files> element, then all files and folder from the directory that the .nuspec is in will be included.

I expect that the behavior between the two platforms is the same. I don't care which behavior it is, just that it is the same,

How Did You Get This To Happen? (Steps to Reproduce)

1. Create or copy the source for a package to a Linux system with choco
2. Completely remove the <files> element from the .nuspec
3. Run choco pack
4. Inspect the resulting .nupkg and notice that there are no files or folders included. (E.G. the tools directory is missing)

Output Log

Full Log Output

2021-03-05 21:49:24,075 31299 [DEBUG] - XmlConfiguration is now operational
2021-03-05 21:49:24,135 31299 [INFO ] - ============================================================
2021-03-05 21:49:24,635 31299 [INFO ] - Chocolatey v0.10.16-beta-116-gb6f49599
2021-03-05 21:49:24,639 31299 [DEBUG] - Chocolatey is running on Linux v 5.10.0.0
2021-03-05 21:49:24,640 31299 [DEBUG] - Attempting to delete file "/opt/chocolatey/chocolatey.dll.old".
2021-03-05 21:49:24,640 31299 [DEBUG] - Attempting to delete file "/opt/chocolatey/choco.exe.old".
2021-03-05 21:49:24,650 31299 [DEBUG] - Command line: /opt/chocolatey/choco.exe pack --verbose --debug --allow-unofficial
2021-03-05 21:49:24,651 31299 [DEBUG] - Received arguments: pack --verbose --debug --allow-unofficial
2021-03-05 21:49:24,690 31299 [DEBUG] - RemovePendingPackagesTask is now ready and waiting for PreRunMessage.
2021-03-05 21:49:24,700 31299 [DEBUG] - Sending message 'PreRunMessage' out if there are subscribers...
2021-03-05 21:49:24,703 31299 [DEBUG] - [Pending] Removing all pending packages that should not be considered installed...
2021-03-05 21:49:24,742 31299 [DEBUG] - Performing validation checks.
2021-03-05 21:49:24,745 31299 [DEBUG] - Global Configuration Validation Checks:
2021-03-05 21:49:24,746 31299 [DEBUG] -  - Package Exit Code / Exit On Reboot = Checked
2021-03-05 21:49:24,746 31299 [DEBUG] - System State Validation Checks:
2021-03-05 21:49:24,749 31299 [INFO ] - 2 validations performed. 2 success(es), 0 warning(s), and 0 error(s).
2021-03-05 21:49:24,749 31299 [DEBUG] - The source 'https://chocolatey.org/api/v2/' evaluated to a 'normal' source type
2021-03-05 21:49:24,750 31299 [DEBUG] -
NOTE: Hiding sensitive configuration data! Please double and triple
 check to be sure no sensitive data is shown, especially if copying
 output to a gist for review.
2021-03-05 21:49:24,767 31299 [DEBUG] - Configuration: CommandName='pack'|CacheLocation='/tmp/chocolatey'|
ContainsLegacyPackageInstalls='True'|
CommandExecutionTimeoutSeconds='2700'|WebRequestTimeoutSeconds='30'|
Sources='https://chocolatey.org/api/v2/'|SourceType='normal'|
Debug='True'|Verbose='True'|Trace='False'|Force='False'|Noop='False'|
HelpRequested='False'|UnsuccessfulParsing='False'|RegularOutput='True'|
QuietOutput='False'|PromptForConfirmation='True'|AcceptLicense='False'|
AllowUnofficialBuild='True'|AllVersions='False'|
SkipPackageInstallProvider='False'|Prerelease='False'|ForceX86='False'|
OverrideArguments='False'|NotSilent='False'|
ApplyPackageParametersToDependencies='False'|
ApplyInstallArgumentsToDependencies='False'|IgnoreDependencies='False'|
AllowMultipleVersions='False'|AllowDowngrade='False'|
ForceDependencies='False'|Information.PlatformType='Linux'|
Information.PlatformVersion='5.10.0.0'|
Information.PlatformName='Linux'|
Information.ChocolateyVersion='0.10.16.0'|
Information.ChocolateyProductVersion='0.10.16-beta-116-gb6f49599'|
Information.FullName='chocolatey, Version=0.10.16.0, Culture=neutral, PublicKeyToken=fd112f53c3ab578c'|

Information.Is64BitOperatingSystem='True'|
Information.Is64BitProcess='True'|Information.IsInteractive='False'|
Information.UserName=redacted
Information.IsUserAdministrator='False'|
Information.IsUserSystemAccount='False'|
Information.IsUserRemoteDesktop='False'|
Information.IsUserRemote='True'|
Information.IsProcessElevated='False'|
Information.IsLicensedVersion='False'|Information.LicenseType='Foss'|
Information.CurrentDirectory='pkg-testing/no-files-zfsin'|

Features.AutoUninstaller='True'|Features.ChecksumFiles='True'|
Features.AllowEmptyChecksums='False'|
Features.AllowEmptyChecksumsSecure='True'|
Features.FailOnAutoUninstaller='False'|
Features.FailOnStandardError='False'|Features.UsePowerShellHost='True'|
Features.LogEnvironmentValues='False'|Features.LogWithoutColor='False'|
Features.VirusCheck='False'|
Features.FailOnInvalidOrMissingLicense='False'|
Features.IgnoreInvalidOptionsSwitches='True'|
Features.UsePackageExitCodes='True'|
Features.UseEnhancedExitCodes='False'|
Features.UseFipsCompliantChecksums='False'|
Features.ShowNonElevatedWarnings='True'|
Features.ShowDownloadProgress='True'|
Features.StopOnFirstPackageFailure='False'|
Features.UseRememberedArgumentsForUpgrades='False'|
Features.IgnoreUnfoundPackagesOnUpgradeOutdated='False'|
Features.SkipPackageUpgradesWhenNotInstalled='False'|
Features.RemovePackageInformationOnUninstall='False'|
Features.ExitOnRebootDetected='False'|
Features.LogValidationResultsOnWarnings='True'|
Features.UsePackageRepositoryOptimizations='True'|
Features.ScriptsCheckLastExitCode='False'|
ListCommand.LocalOnly='False'|
ListCommand.IdOnly='False'|ListCommand.IncludeRegistryPrograms='False'|
ListCommand.PageSize='25'|ListCommand.Exact='False'|
ListCommand.ByIdOnly='False'|ListCommand.ByTagOnly='False'|
ListCommand.IdStartsWith='False'|ListCommand.OrderByPopularity='False'|
ListCommand.ApprovedOnly='False'|
ListCommand.DownloadCacheAvailable='False'|
ListCommand.NotBroken='False'|
ListCommand.IncludeVersionOverrides='False'|
UpgradeCommand.FailOnUnfound='False'|
UpgradeCommand.FailOnNotInstalled='False'|
UpgradeCommand.NotifyOnlyAvailableUpgrades='False'|
UpgradeCommand.ExcludePrerelease='False'|
NewCommand.AutomaticPackage='False'|
NewCommand.UseOriginalTemplate='False'|SourceCommand.Command='unknown'|
SourceCommand.Priority='0'|SourceCommand.BypassProxy='False'|
SourceCommand.AllowSelfService='False'|
SourceCommand.VisibleToAdminsOnly='False'|
FeatureCommand.Command='unknown'|ConfigCommand.Command='unknown'|
ApiKeyCommand.Remove='False'|PinCommand.Command='unknown'|
OutdatedCommand.IgnorePinned='False'|Proxy.BypassOnLocal='True'|
2021-03-05 21:49:24,767 31299 [DEBUG] - _ Chocolatey:ChocolateyPackCommand - Normal Run Mode _
2021-03-05 21:49:24,955 31299 [INFO ] - Attempting to build package from 'zfsin.nuspec'.
2021-03-05 21:49:25,090 31299 [INFO ] - Successfully created package 'pkg-testing/no-files-zfsin/zfsin.0.24-eljun.nupkg'
2021-03-05 21:49:25,091 31299 [DEBUG] - Sending message 'PostRunMessage' out if there are subscribers...
2021-03-05 21:49:25,093 31299 [DEBUG] - Exiting with 0

[TheCakeIsNaOH]

This should be fixed by chocolatey/nuget-chocolatey#21