When the client closes websocket connections that sends container
output through websocket, an error message is displayed:
"Error attaching websocket: %!s(<nil>)"
This message is misleading. Thus, this change suggests to check
if error is nil and print the correct message accordingly.
Signed-off-by: Boaz Shuster <ripcurld.github@gmail.com>
Upstream-commit: 8f65bb6d90e3a95420bb634e415c3cce36d86201
Component: engine