Docker unreachable error not reported by server on websocket connect

[kvchitrapu]

Describe the bug When starting the server with Docker stopped, the server throws a backtrace error indicating Docker is not reachable instead of a clear error message.

Steps to Reproduce

1. Stop Docker.
2. Execute the command: $ uvicorn opendevin.server.listen:app --reload --port 3000.
3. Attempt to connect via WebSocket: websocat ws://127.0.0.1:3000/ws.

Expected behavior The server should report a clear error message indicating Docker is down and a WebSocket connection cannot be established.

Actual behavior The server starts and accepts the WebSocket connection, but upon attempting any operation that requires Docker, it crashes with a backtrace error pointing to Docker connectivity issues. The error log is as follows:

$ uvicorn opendevin.server.listen:app --reload --port 3000
INFO:     Will watch for changes in these directories: ['./OpenDevin-rbren/OpenDevin']
INFO:     Uvicorn running on http://127.0.0.1:3000 (Press CTRL+C to quit)
INFO:     Started reloader process [16775] using WatchFiles
INFO:     Started server process [16779]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
INFO:     ('127.0.0.1', 49231) - "WebSocket /ws" [accepted]
INFO:     connection open
ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "/opt/homebrew/lib/python3.11/site-packages/urllib3/connectionpool.py", line 793, in urlopen
    response = self._make_request(
               ^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/lib/python3.11/site-packages/urllib3/connectionpool.py", line 496, in _make_request
    conn.request(
  File "/opt/homebrew/lib/python3.11/site-packages/urllib3/connection.py", line 400, in request
    self.endheaders()
  File "/opt/homebrew/Cellar/[email protected]/3.11.7_2/Frameworks/Python.framework/Versions/3.11/lib/python3.11/http/client.py", line 1289, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/opt/homebrew/Cellar/[email protected]/3.11.7_2/Frameworks/Python.framework/Versions/3.11/lib/python3.11/http/client.py", line 1048, in _send_output
    self.send(msg)
  File "/opt/homebrew/Cellar/[email protected]/3.11.7_2/Frameworks/Python.framework/Versions/3.11/lib/python3.11/http/client.py", line 986, in send
    self.connect()
  File "/opt/homebrew/lib/python3.11/site-packages/docker/transport/unixconn.py", line 27, in connect
    sock.connect(self.unix_socket)