Do not generate conformers that will not be used (#315)

* Do not generate conformers that will not be used

* bump ci

---------

Co-authored-by: Mike Henry <11765982+mikemhenry@users.noreply.github.com>

openmmforcefields/generators/template_generators.py

@@ -608,9 +608,6 @@ def generate_residue_template(self, molecule, residue_atoms=None):
             _logger.debug(f'Using user-provided charges because partial charges are nonzero...')
         else:
             _logger.debug(f'Computing AM1-BCC charges...')
-            # NOTE: generate_conformers seems to be required for some molecules
-            # https://github.com/openforcefield/openff-toolkit/issues/492
-            molecule.generate_conformers(n_conformers=10)
             molecule.assign_partial_charges(partial_charge_method='am1bcc')
 
         # Geneate a single conformation