Merge pull request #9 from pupil-labs/propagate-pi-gaze-items-exceptions

Surface assertion exceptions being thrown to the UI

pupil_src/launchables/player.py

@@ -789,6 +789,7 @@ def on_drop(window, count, paths):
                     um.update_recording_to_recent(rec_dir)
                 except AssertionError as err:
                     logger.error(str(err))
+                    tip = "Oops! There was an error updating the recording."
                     rec_dir = None
                 else:
                     glfw.glfwSetWindowShouldClose(window, True)