fix divide by zero

bridge_master.py

@@ -1772,7 +1772,8 @@ class routerOBP(OPENBRIDGE):
             if (_frame_type == HBPF_DATA_SYNC) and (_dtype_vseq == HBPF_SLT_VTERM):
                 call_duration = pkt_time - self.STATUS[_stream_id]['START']
                 packet_rate = 0
-                packet_rate = self.STATUS[_stream_id]['packets'] / call_duration
+                if call_duration:
+                    packet_rate = self.STATUS[_stream_id]['packets'] / call_duration
                 logger.info('(%s) *CALL END*   STREAM ID: %s SUB: %s (%s) PEER: %s (%s) TGID %s (%s), TS %s, Duration: %.2f, Packet rate: %.2f/s', \
                         self._system, int_id(_stream_id), get_alias(_rf_src, subscriber_ids), int_id(_rf_src), get_alias(_peer_id, peer_ids), int_id(_peer_id), get_alias(_dst_id, talkgroup_ids), int_id(_dst_id), _slot, call_duration, packet_rate)
                 if CONFIG['REPORTS']['REPORT']:
@@ -2502,7 +2503,8 @@ class routerHBP(HBSYSTEM):
             if (_frame_type == HBPF_DATA_SYNC) and (_dtype_vseq == HBPF_SLT_VTERM) and (self.STATUS[_slot]['RX_TYPE'] != HBPF_SLT_VTERM):
                 packet_rate = 0
                 call_duration = pkt_time - self.STATUS[_slot]['RX_START']
-                packet_rate = self.STATUS[_slot]['packets'] / call_duration
+                if call_duration:
+                    packet_rate = self.STATUS[_slot]['packets'] / call_duration
                 logger.info('(%s) *CALL END*   STREAM ID: %s SUB: %s (%s) PEER: %s (%s) TGID %s (%s), TS %s, Duration: %.2f, Packet rate: %.2f/s', \
                         self._system, int_id(_stream_id), get_alias(_rf_src, subscriber_ids), int_id(_rf_src), get_alias(_peer_id, peer_ids), int_id(_peer_id), get_alias(_dst_id, talkgroup_ids), int_id(_dst_id), _slot, call_duration,packet_rate)
                 if CONFIG['REPORTS']['REPORT']: