Clear breakpoints

def clear_breakpoints(self):
        """Clear breakpoints"""
        self.breakpoints = []
        for data in self.editor.blockuserdata_list[:]:
            data.breakpoint = False
            # data.breakpoint_condition = None  # not necessary, but logical
            if data.is_empty():
                # This is not calling the __del__ in BlockUserData.  Not
                # sure if it's supposed to or not, but that seems to be the
                # intent.
                del data