Fix datalad --help to not have *Global options* empty and list options in "options:" section

[yarikoptic]

Detected while considering #7027 (note: that one is against master, this one -- maint)

I believe came up as a regression of e89ce43 and since we had no unittest. So I also added a test.

Without this fix --help looked like

options:
  -c (:name|name=value)
...
*Global options*

and nothing at the end after Global options.

[yarikoptic]

although changelog commit no longer has [ci skip] it seems that github completely skips that updated state in its CI. @jwodder any ideas on why that might be happening?

unfortunately adjusted test fails on travis and appveyor... need to figure why (passes locally). Could be python (argparse) version or how we install for testing... will need to troubleshoot

[jwodder]

@yarikoptic I think this may be because the snippet is pushed using secrets.GITHUB_TOKEN, so GitHub doesn't trigger any workflows in order to avoid a potential infinite loop of workflows.

[yarikoptic]

@yarikoptic I think this may be because the snippet is pushed using secrets.GITHUB_TOKEN, so GitHub doesn't trigger any workflows in order to avoid a potential infinite loop of workflows.

hm, may be, odd though. I wish there was some log to check on github which might have given explanation. If we would not be able to overcome this limitation, it would be quite suboptimal :-/

[yarikoptic]

failures on travis and appveyor unrelated now.

[mih]

Works for me! Thx

[yarikoptic-gitmate]

PR released in 0.17.6