Bug: dropping search terms in sqlite branch

[bwgoudey]

I defined two groups:
OCT_left = OCT measured (left) 6072 100274 1 Measurable
MRI = Brain MRI measuring method 12187 470 0 Direct entry

I add OCT_left and then MRI into the all_of query box
When I conduct a query, the resulting cohort criteria only contains the MRI term
{'all_of': [('12187', '0')], 'any_of': [], 'none_of': []}

need to figure out why. This is probably an issue in the query_app.py