Removed logging.debug message in reaction.py __setDegeneracy()

Due to the numerous calls to __setDegeneracy(), this debug message
appears repeatedly while debuging (or running tests with -d). In fact,
it could get printed so many times that it fills the CMD stack.

rmgpy/reaction.py

@@ -180,9 +180,9 @@ def __setDegeneracy(self, new):
             else:
                 degeneracyRatio = (new*1.0) / self._degeneracy
             self.kinetics.changeRate(degeneracyRatio)
-        else:
-            logging.debug('did not modify A factor when modifying degeneracy since ' \
-                          'the reaction rate was not set')
+        #else:
+        #    logging.debug('did not modify A factor when modifying degeneracy since ' \
+        #                  'the reaction rate was not set')
         # set new degeneracy
         self._degeneracy = new
     degeneracy = property(__getDegneneracy, __setDegeneracy)