local variable 'values' referenced before assignment

[freegroup]

On Android I get in some cases a exception by calling `_get_orientation" in AndroidSpOrientation

12-13 13:42:29.786 24276 24318 I python  :    File "kivy/_clock.pyx", line 649, in kivy._clock.CyClockBase._process_events
12-13 13:42:29.787 24276 24318 I python  :    File "kivy/_clock.pyx", line 218, in kivy._clock.ClockEvent.tick
12-13 13:42:29.788 24276 24318 I python  :    File "/Users/d023280/Documents/workspace/candle/mobile/.buildozer/android/app/utils/compass.py", line 38, in update_compass
12-13 13:42:29.789 24276 24318 I python  :    File "/Users/d023280/Documents/workspace/candle/mobile/.buildozer/android/platform/build-arm64-v8a/build/python-installs/candle/arm64-v8a/plyer/utils.py", line 114, in __getattribute__
12-13 13:42:29.790 24276 24318 I python  :    File "/Users/d023280/Documents/workspace/candle/mobile/.buildozer/android/platform/build-arm64-v8a/build/python-installs/candle/arm64-v8a/plyer/facades/spatialorientation.py", line 35, in orientation
12-13 13:42:29.791 24276 24318 I python  :    File "/Users/d023280/Documents/workspace/candle/mobile/.buildozer/android/platform/build-arm64-v8a/build/python-installs/candle/arm64-v8a/plyer/platforms/android/spatialorientation.py", line 98, in _get_orientation
12-13 13:42:29.792 24276 24318 I python  :  UnboundLocalError: local variabl