remove traceback usage, add test

lbry/cli.py

@@ -176,9 +176,10 @@ def ensure_directory_exists(path: str):
 async def execute_command(conf, method, params):
     client = Client(f"http://{conf.api}/ws")
     await client.connect()
-    resp = await client.send(method, **params)
-    print(await resp.first)
+    resp = await (await client.send(method, **params)).first
+    print(resp)
     await client.disconnect()
+    return resp
 
 
 def normalize_value(x, key=None):

lbry/service/daemon.py

@@ -160,8 +160,6 @@ class Daemon:
                     '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

tests/integration/service/test_daemon.py

@@ -6,8 +6,10 @@ from threading import Thread
 from unittest import TestCase
 
 from lbry import Daemon, FullNode
+from lbry.cli import execute_command
 from lbry.console import Console
 from lbry.blockchain.lbrycrd import Lbrycrd
+from lbry.testcase import CommandTestCase
 
 
 class TestShutdown(TestCase):
@@ -33,3 +35,14 @@ class TestShutdown(TestCase):
         thread.start()
 
         daemon.run()
+
+
+class WebSocketAPITestCase(CommandTestCase):
+    async def test_api_failure_over_websocket_doesnt_hang(self):
+        self.assertEqual(
+            await asyncio.wait_for(
+                execute_command(self.daemon.conf, 'resolve', {'crazyparameters': 'not there'}),
+                timeout=1
+            ),
+            "unexpected error: resolve() got an unexpected keyword argument 'crazyparameters'"
+        )