type hints for messaging (#2061)

* bump cereal

* fix bugs found by mypy

* bump cereal

selfdrive/debug/get_fingerprint.py

@@ -17,6 +17,9 @@ logcan = messaging.sub_sock('can')
 msgs = {}
 while True:
   lc = messaging.recv_sock(logcan, True)
+  if lc is None:
+    continue
+
   for c in lc.can:
     # read also msgs sent by EON on CAN bus 0x80 and filter out the
     # addr with more than 11 bits

selfdrive/debug/internal/measure_modeld_packet_drop.py

@@ -11,6 +11,9 @@ if __name__ == "__main__":
 
   while True:
     m = messaging.recv_one(modeld_sock)
+    if m is None:
+      continue
+
     frame_id = m.model.frameId
     t = m.logMonoTime / 1e9
     frame_cnt += 1

tools/replay/sensorium.py

@@ -26,7 +26,7 @@ if __name__ == "__main__":
 
   while 1:
     fpkt = messaging.recv_one(frame)
-    if len(fpkt.frame.image) == 0:
+    if fpkt is None or len(fpkt.frame.image) == 0:
       continue
     sm.update(timeout=1)
     rgb_img_raw = fpkt.frame.image