Added extra error for when bytes_data is revieved #1456
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I'm trying to set up a connection from Godot to Django Channels. I'm learning about how the websocket handshake and transfer protocol needs to work, and found that an error I was getting wasn't very explicit. This PR adds some more information in the case where bytes_data is received, but not text_data.
If I need to clean up this PR at all, I'll be more than happy to!