return errors when websocket req fails

lbry/service/daemon.py

@@ -152,12 +152,19 @@ class Daemon:
         else:
             params = msg.get('params', {})
             method = getattr(self.api, msg['method'])
+            try:
                 result = await method(**params)
                 encoded_result = jsonrpc_dumps_pretty(result, service=self.service)
                 await web_socket.send_json({
                     'id': msg.get('id', ''),
                     'result': encoded_result
                 })
+            except Exception as e:
+                import traceback
+                traceback.print_exc()
+                log.exception("RPC error")
+                await web_socket.send_json({'id': msg.get('id', ''), 'result': "unexpected error: " + str(e)})
+                raise e
 
     @staticmethod
     async def on_shutdown(app):