Don't throw if rfile is closed (#28)

* Don't throw if rfile is closed

* Update streams.py

* Retrigger CI

Author: jroitgrund

pyls_jsonrpc/streams.py

@@ -22,7 +22,13 @@ def listen(self, message_consumer):
             message_consumer (fn): function that is passed each message as it is read off the socket.
         """
         while not self._rfile.closed:
-            request_str = self._read_message()
+            try:
+                request_str = self._read_message()
+            except ValueError:
+                if self._rfile.closed:
+                    return
+                else:
+                    log.exception("Failed to read from rfile")
 
             if request_str is None:
                 break