Avoid indexing accession for replaced objects so it can be added to the alternate_accession of the replacing object.
Merge remote-tracking branch 'origin/master' into 866-accession-replacement
Handle test case where item has no accession property.
Merge remote-tracking branch 'origin/master' into 866-accession-replacement

Conflicts:
	src/encoded/views/views.py
Merge pull request #270 from ENCODE-DCC/866-accession-replacement

Avoid indexing accession for replaced objects so it can be added to the ...