Internal Server Error when expand_mappings=true is used in conjunction with include=

[twktheainur]

stack.txt
When expand_mappings=true and we do not restrict the ontologies to use for the annotation, using include=X (any attribute) leads to Internal Server Error.

This causes Internal Server Error
http://data.bioontology.org/annotator?text=cancer&include=prefLabel&display_links=false&display_context=false&expand_mappings=true

This works:
http://data.bioontology.org/annotator?text=cancer&include=prefLabel&display_links=false&display_context=false&expand_mappings=true&ontologies=NCIT,GO

This works:
http://data.bioontology.org/annotator?text=cancer&display_links=false&display_context=false&expand_mappings=true

I am including a stack trace from ontologies_api
stack.txt

[jonquet]

@graybeal Just to be sure you have seen this. This shall not be a big fix.

[graybeal]

Reference also ncbo/bioportal_web_ui#7