MITLibraries / geo-harvester / 8438177369

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Post normalize data quality hooks

Why these changes are being introduced:

It was discovered that some TIMDEX records had empty strings for 'subjects' field that originated
from this harvester.  While it could be addressed whack-a-mole style at the individual metadata format
normalization logic, a more holistic approach is performing some data cleanup after normalization
logic has taken place, removing values that should never end up in the final MITAardvark record.

How this addresses that need:
* adds post normalization data cleanup method _remove_none_and_blank_strings()
* adds post normalization data cleanup method _dedupe_list_fields()
* both methods are run for all field and values, for all source record normalizations

Side effects of this change:
* None values and empty strings removed from final MITAardvark record

Relevant ticket(s):
* https://mitlibraries.atlassian.net/browse/GDT-241

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