Throwing Error in logs section(Recent Log messages) if key is missing

Patch looks good, creating an MR for it.

lavanyatalwar → closed merge request !34

Moving the issue to NR.

I have reviewed the changes and the changes looks good to me and are made as expected by the issue because now if the key is missing then the metadata will not be checked,
Thus moving it to RTBC+!

1) please target branch 3.2.x
2) please add automated tests to prove the issue
3) since we accept that a $key can be NULL (see method signature), I do not think this is acceptable...

I have tested this patch.

It does solve the issue with exceptions logging, but it will break derivatives generation in other instances.
For example, for "imagemagick_identify" metadata the key can be empty, otherwise, if we skip, it doesn't generate metadata and the image derivative generation fails later.