Commented avatar not visible in sidebar for now.

[ivan-nginx]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines.
• Tests for the changes have been added (for bug fixes / features).
• Docs have been added / updated (for bug fixes / features).

PR Type

What kind of change does this PR introduce?

• Bugfix.
• Feature.
• Code style update (formatting, local variables).
• Refactoring (no functional changes, no api changes).
• Build related changes.
• CI related changes.
• Documentation content changes.
• Other... Please describe:

What is the current behavior?

Default avatar loading if avatar option commented.
Issue Number(s): #1789.

What is the new behavior?

Default avatar not loading if avatar option commented.

• Screens with this changes:
  

• Link to demo site with this changes: http://test.almostover.ru

How to use?

In NexT _config.yml:

#avatar: /images/avatar.gif

Does this PR introduce a breaking change?

• Yes.
• No.