Yago González ca190bd394 bug fix: Handle empty at-mentions gracefully. ...

An exception in the webapp was trown when an empty mention was sent.
Examples of problematic messages are "@" or "@****".

In order to fix this, the regex that identifies mentions has been
modified, so it now requires the mention to have a "content" (by
replacing the ? quantifier by +).

A test case has been added to `frontend_tests/node_tests/echo.js` to
check that this works properly in the future.

2016-12-21 15:32:12 -08:00

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