Empty messages being sent in the chat

[pkesavap]

I was pissed at a call and i kept pressing enter key (as every developer does i hope, :) ) i could see loads of messages being sent, in the UI, which IMHO did not feel like it was necessary

Please feel free to close, if this is intentionally left out.

[pkesavap]

I have created a PR which addresses this issue as well #74