missing return, unused imports

software/control/widgets.py

@@ -297,6 +297,7 @@ def save_to_filename(self, filename: str):
                 return True
         except IOError:
             self._log.exception(f"Failed to write config file to '{filename}'")
+            return False
 
     def save_to_file(self):
         self.save_config()

software/tests/control/gui_test_stubs.py

@@ -1,10 +1,5 @@
 import os
 import pathlib
-from typing import Callable
-import time
-
-from PyQt5.QtCore import QTimer
-from PyQt5.QtWidgets import QDialog, QApplication
 
 import control.core.core
 import control.microcontroller