Previously /mode #channel failed with an exception trying to
get the arguments. Now it works as expected.
Also fix an issue with silence chars not being propagated to
channel command - /.topic #channel will now work silently.
Change-Id: Ifa314b0daf81a30003d5879b9484e759668bc763
Fixes-Issue: CLIENT-455
Reviewed-on: http://gerrit.dmdirc.com/3208
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>