Fix error that occurs when DSL selection for ligand is "(mass > 1.5)"
@@ -423,7 +423,7 @@ class Topography(object):
# The self here is inherited from the outer scope
region_output_unmapped = list(self._get_region_set(region_string))
region_output = [item for item in region_output_unmapped if item in atom_map]
- except (SyntaxError, ValueError) as e:
+ except (SyntaxError, ValueError, TypeError) as e:
# Make this a local variable
region_error = e
region_output = None
