client/brain: Only catch actual exceptions (i.e. not SystemExit)

This resolves #432.

Author: Holzhaus

client/brain.py

@@ -71,7 +71,7 @@ def query(self, texts):
                                        "'%s'", text, module.__name__)
                     try:
                         module.handle(text, self.mic, self.profile)
-                    except:
+                    except Exception:
                         self._logger.error('Failed to execute module',
                                            exc_info=True)
                         self.mic.say("I'm sorry. I had some trouble with " +