fix add missing residues error

Author: ndonyapour

pdbfixer/pdbfixer.py

@@ -383,7 +383,7 @@ def _addAtomsToTopology(self, heavyAtomsOnly, omitUnknownMolecules):
 
                 # Insert missing residues here.
 
-                if (chain.index, indexInChain) in self.missingResidues:
+                if (chain.index, indexInChain) in self.missingResidues and residue in self.templates:
                     insertHere = self.missingResidues[(chain.index, indexInChain)]
                     endPosition = self._computeResidueCenter(residue)
                     if indexInChain > 0: