Custom Fields not optional during issue create?

[mavjsh]

go-atlassian version
main

go-atlassian component

• Jira Software Cloud
• Jira Agile Cloud
• Jira Service Management Cloud
• Confluence Cloud
• Atlassian Admin Cloud

Describe the bug 🐛
In the docs it states that custom fields are optional(https://docs.go-atlassian.io/cookbooks/create-jira-issue#step-5-custom-fields-definition). But this(

go-atlassian/pkg/infra/models/jira_issue_v2.go

Line 26 in 0df29d4

return nil, ErrNoCustomFieldError

) returns an error if you pass an empty CustomFields{} struct. The docs don't explain how to do this optionally.

To Reproduce 🚧
```
payload := &jiramodels.IssueSchemeV2{
Fields: &jiramodels.IssueFieldsSchemeV2{
Summary: summary,
Project: &jiramodels.ProjectScheme{ID: "10000"},
IssueType: &jiramodels.IssueTypeScheme{Name: "Story"},
Description: description,
},
}

var customFields = jiramodels.CustomFields{}

_, _, err := atlassian.Issue.Create(context.Background(), payload, &customFields)
if err != nil {
	log.Fatal(err)
}

**Expected behavior** :white_check_mark: 
I expect the issue to create.
**Screenshots** :page_facing_up: 
"no custom-fields set"
**Additional context**

**Code snippet**

[ctreminiom]

Hi @mavjsh,

Thank you for investing time in this project!.

I just created the PR: #302 that fixes that error.