Fixing an issue where tokens under min length were not being skipped when setting 'ignore_syntax=True'.  This was leading to a division by zero error in get_similarity() since X and Y would often be empty sets in this case.
Fixing an issue where tokens under min length were not being skipped when setting 'ignore_syntax=True'.  This was leading to a division by zero error in get_similarity() since X and Y would often be empty sets in this case.

Georgetown-IR-Lab/QuickUMLS