code: def removeAssociation(self, server_url, handle):
          
          assoc = self.getAssociation(server_url, handle)
          if assoc is None:
              return 0
          else:
              filename = self.getAssociationFilename(server_url, handle)
              return _removeIfPresent(filename)
docs: Remove an association if it exists. Do nothing if it does not.
  
          (str, str) -> bool