Declare variable before using it.
Merge pull request #294 from wawe/feature-monitor-time-per-page

Declare variable before using it.
Fix unavailable variable in unimplemented method
Fix votes listing if poll.variant isn't set
Allow tag view for tags with colon (fixes #295)
Return 404 instead of 500 if non-existent facet query parameter is used
Hide feedback category selection if none exist