When MobileFrontend is installed a new watchlist page is used when you append ?useformat=mobile to the end of the URI.
On the Watchlist, when there are no results it uses .info and .empty-page class.
It results in text without max-length.
- Limit .empty-page to match the max-width of the header (993.3px)
Although MobileFrontend is needed to replicate this bug, the fix should be added to the relevant skinStyle in Minerva.