Error handling improvement in sendDataThread

- don't uncecessarily report EPIPE as a big error, just close the
  connection

src/class_sendDataThread.py

@@ -77,7 +77,7 @@ class sendDataThread(threading.Thread):
     def sendBytes(self, data = ""):
         self.buffer += data
         if len(self.buffer) < throttle.SendThrottle().chunkSize and self.sendDataThreadQueue.qsize() > 1:
-            return
+            return True
 
         while self.buffer and state.shutdown == 0:
             isSSL = False
@@ -104,16 +104,18 @@ class sendDataThread(threading.Thread):
                     select.select([], [self.sslSock if isSSL else self.sock], [], 10)
                     logger.debug('sock.recv retriable error')
                     continue
+                if e.errno in (errno.EPIPE):
+                    logger.debug('Connection broken')
+                    return False
                 raise
             throttle.SendThrottle().wait(amountSent)
             self.lastTimeISentData = int(time.time())
             self.buffer = self.buffer[amountSent:]
-
+        return True
 
     def run(self):
         logger.debug('sendDataThread starting. ID: ' + str(id(self)) + '. Number of queues in sendDataQueues: ' + str(len(state.sendDataQueues)))
-        while True:
-            self.sendBytes()
+        while self.sendBytes():
             deststream, command, data = self.sendDataThreadQueue.get()
 
             if deststream == 0 or deststream in self.streamNumber: