make action_event a required parameter

openadapt/models.py

@@ -274,23 +274,15 @@ def take_screenshot(cls):
         screenshot = Screenshot(sct_img=sct_img)
         return screenshot
 
-    def crop_active_window(self, action_event=None):
-        if action_event:
-            action_event_to_use = action_event
-        elif self.action_event:
-            action_event_to_use = self.action_event
-        else:
-            logger.info("No action event to use for cropping, image will not be cropped")
-            return
-
-        window_event = action_event_to_use.window_event
+    def crop_active_window(self, action_event):
+        window_event = action_event.window_event
         width_ratio, height_ratio = utils.get_scale_ratios(action_event)
 
         x0 = window_event.left * width_ratio
         y0 = window_event.top * height_ratio
         x1 = x0 + window_event.width * width_ratio
         y1 = y0 + window_event.height * height_ratio
-        
+
         box = (x0, y0, x1, y1)
         self._image = self._image.crop(box)