Raise NothingToCommit when there is nothing to commit

[soininen]

It is now possible to ignore the specific condition of nothing-to-commit:

with suppress(NothingToCommit):
    db_map.commit_session("May or may contain changes.")

No associated issue.

Checklist before merging

• Documentation (also in Toolbox repo) is up-to-date
• Release notes have been updated
• Unit tests have been added/updated accordingly
• Code has been formatted by black & isort
• Unit tests pass

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.13%. Comparing base (2bbfd92) to head (7ce0427).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #455      +/-   ##
==========================================
- Coverage   79.13%   79.13%   -0.01%     
==========================================
  Files          77       77              
  Lines       10099    10102       +3     
  Branches     2142     1806     -336     
==========================================
+ Hits         7992     7994       +2     
- Misses       1756     1760       +4     
+ Partials      351      348       -3     

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