Make sure a campaign exists before rendering WikiGrokDialog

Also update tests

Bug: T78340
Change-Id: I9b06cade0125182515badbce4ea7acc79426b169
Do not show donate button when enabled on special pages

Change-Id: Id3b450b978ed49290ef0d17bcfd1d8eae704df78
Merge "Make sure a campaign exists before rendering WikiGrokDialog"
Merge "Do not show donate button when enabled on special pages"