Avoid nullpointer for publisher
Discard records without a valid author as requested in #4392, #4393, #4395, #4396.If the record has also at least one valid author, the record is kept but the invalid authors are removed.
Workaround for #4362: instances from Unpaywall mapped into licenses and then lost
Addressing quality of the research graph: #4368 and #4360.
add provenance to bulktagging
updated label for a counter that I hope I will never see
removed useless comment
refactoring and update of default variable values
remove from context association to Zenodo Community and refactoring of code
propagation of country from institutional repository and of result projects through semantic link
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