changed the way the gesture method handles reading when no data.

adafruit_apds9960/apds9960.py

@@ -204,12 +204,10 @@ class APDS9960:
             up_down_diff = 0
             left_right_diff = 0
             gesture_received = 0
-
             time.sleep(0.030) # 30 ms
 
             n_recs = self._read8(APDS9960_GFLVL)
-            if not n_recs:
-                continue
+            if n_recs:
 
                 with self.i2c_device as i2c:
                     i2c.write(buffer, end=1, stop=False)
@@ -255,7 +253,7 @@ class APDS9960:
                             self._saw_left_start += 1
 
                 # saw a leading or trailing edge; start timer
-            if up_down_diff != 0 or left_right_diff != 0:
+                if up_down_diff or left_right_diff:
                     time_mark = time.monotonic()
 
             # finished when a gesture is detected or ran out of time (300ms)