Index a minimal (pid only) document if the document is prefiltered.
This avoids an server error when saving to solr.
Issue curationexperts/tufts-image-library#174

Code ported from:
https://github.com/TuftsUniversity/tuftsification-hydra/commit/ab4d5acf86991ee3e50414f4b171f156fd668fec
added valid pid checking
Add namespacing to fixtures task and use gem fixtures
Merge pull request #6 from curationexperts/fix_fixtures

Add namespacing to fixtures task and use gem fixtures
removed devise version dependency, fixed a typo
Add additional testing fixtures
Add an appropriate solr prefix for TuftsFileMeta
Copied tests from MIRA
commit: https://github.com/curationexperts/mira/commit/3a891ad8808774581a6cf2f689cf3325a374dca4
Copy in test from mira
From commit:
https://github.com/curationexperts/mira/commit/3c52f6664ca9a9f684cea3e184e208b611914b90
Remove art & art history fixtures from test list
recognize additional models for object type facet
don't index collection info for now in MIRA

when we merge this indexing code with TDL
we'll have to address this
Merge branch 'additional_models' of github.com:mkorcy/tufts_models into additional_models

* 'additional_models' of github.com:mkorcy/tufts_models:
  don't index collection info for now in MIRA
  recognize additional models for object type facet