Fix:Remove authors with no books when a books is removed #3668 #3670
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Brief summary
See #3668 for the outlined issue
Which issue is fixed?
Fixes #3668
In-depth Description
Anytime a book is removed/updated we need to ensure that authors with no books (and metadata) and empty series get cleaned up.
This PR adds 2 functions that take in an array of seriesIds and authorIds. Those series & authors are checked for removal.
How have you tested this?
Working on unit test.