Prevent exception if the query doesn't return rows

[mrm-david]

Trying to get rows from the cursor when the query doesn't return rows will raise an exception.

sqlalchemy.exc.ResourceClosedError: This result object does not return rows. It has been closed automatically.

An example such request would for, by example, in mysql SET some_variable = some_value

[OCA-git-bot]

Hi @anddago78,
some modules you are maintaining are being modified, check this out!

[mrm-david]

Note: I have no idea how I could write a unit test for this

[mrm-david]

Also should I fix the trailing space in the comment to have 1 more check that pass, or leave it as is (automatically corrected)

[legalsylvain]

Run
pre-commit run -a
Should fix the syntax error.

[github-actions]

There hasn't been any activity on this pull request in the past 4 months, so it has been marked as stale and it will be closed automatically if no further activity occurs in the next 30 days.
If you want this PR to never become stale, please ask a PSC member to apply the "no stale" label.

[dreispt]

Superseded by #274