Fail post with %% in hyperlink

Just write in mattermost chat
test.test/%%
Received empty line.

Version: 3.1.0
Build Number: 3.1.0
Build Date: Mon Jun 13 19:08:00 UTC 2016
Build Hash: 974238231b9cdbd39a825ec8e9299fbb0b51f6b8
Build Enterprise Ready: false
DB Version: 3.1.0