Do not check for remote modules if main project is vendored

[bep]

I have this issue now with the Hugo docs now -- it has all modules vendored, yet I get this:

go: github.com/gohugoio/[email protected]: invalid version: git fetch -f https://github.com/gohugoio/gohugoioTheme refs/heads/*:refs/heads/* refs/tags/*:refs/tags/* in /var/folders/n6/s_85mm8d31j6yctssnmn_g1r0000gn/T/hugo_cache/modules/filecache/modules/pkg/mod/cache/vcs/9e5a73dca9c7e2dc2c7fb3229c58019935bb92360e5180ff8183a1a74535baf5: exit status 128:
        fatal: not a git repository (or any of the parent directories): .git
Error: failed to download modules: go command failed: go: github.com/gohugoio/[email protected]: invalid version: git fetch -f https://github.com/gohugoio/gohugoioTheme refs/heads/*:refs/heads/* refs/tags/*:refs/tags/* in /var/folders/n6/s_85mm8d31j6yctssnmn_g1r0000gn/T/hugo_cache/modules/filecache/modules/pkg/mod/cache/vcs/9e5a73dca9c7e2dc2c7fb3229c58019935bb92360e5180ff8183a1a74535baf5: exit status 128:
        fatal: not a git repository (or any of the parent directories): .git

[bep]

OK, I will fix this by not doing any remote modules checking if the main project is vendored (/_vendor). This will allow for fully standalone project not needing any network connection/Go installed etc.

You can run:

hugo --ignoreVendor

If you want to see how it looks like with what is in go.mod.

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