Fix omitted template accumulation.

wrappers/python/simtk/openmm/app/forcefield.py

@@ -657,6 +657,7 @@ class ForceField(object):
                 # Residue is unique.
                 unique_unmatched_residues.append(residue)
                 signatures.add(signature)
+                templates.append(template)
 
         return [unique_unmatched_residues, templates]
 

wrappers/python/tests/TestForceField.py

@@ -261,10 +261,10 @@ class TestForceField(unittest.TestCase):
             from uuid import uuid4
             template_name = uuid4()
             # Create residue template.
-            template = ForceField._createResidueTemplate(residue)
-            template.name = template_name
+            template = ForceField._createResidueTemplate(residue) # use helper function
+            template.name = template_name # replace template name
             for (template_atom, residue_atom) in zip(template.atoms, residue.atoms()):
-                template_atom.type = 'XXX'
+                template_atom.type = 'XXX' # replace atom type
             # Register the template.
             forcefield.registerResidueTemplate(template)
 
@@ -380,6 +380,7 @@ class TestForceField(unittest.TestCase):
         # Check results.
         self.assertEqual(len(unmatched_residues), 24)
         self.assertEqual(len(unique_unmatched_residues), 2)
+        self.assertEqual(len(templates), 2)
         unique_names = set([ residue.name for residue in unique_unmatched_residues ])
         self.assertTrue('HOH' not in unique_names)
         self.assertTrue('NA' in unique_names)