Organism script is processing empty animal_parts.tsv lines

[ddooley]

Need to add a test to skip over empty input file line in organism_parts.py. At moment its creating an empty ontology term for each such line.

Also error checking for this situation before organism_parts.py is run would be good: missing leading quote or double-quote in equivalence column data. It triggers a cryptic critical error: ROBOT TEMPLATE JAVA ERROR: 'Range [1, 0) out of bounds for length 1 with no line number of input file that its happening on. E.g. leaving a leading single quote out of '{organism} breast' and ('has part' some ('derives from' some 'bone element')) .