[FEATURE] Do not create empty sync commits

[fmeum]

Is your feature request related to a problem? Please describe.
Currently, APS creates a commit on every sync operation. Most of the time, if not always, this is an empty commit that unnecessarily pollutes the Git history.

Describe the solution you'd like
Either never make the commit (if all other operations commit their changes correctly, it shouldn't be needed at all) or only make it if there are actual changes.

Describe alternatives you've considered
Just leaving this as is, since it is not much of an issue.

Additional context
Tracking #1012 (comment)

[msfjarvis]

Ah forgot to mention this yesterday. I looked at this, and the fix is to bring back the git.status() invocations which then regress committing completely. I'll try again after work.

[haansn08]

This problem is reappearing in version 1.13.1. Empty "[Android Password Store] Sync" commits are being pushed to remote every time the "Synchronize repository" button is pressed. Could this issue be reopened?

[msfjarvis]

Filed #1238 separately to track this as a regression.