fixes empty namespace error

Fixes the empty namespace error which causes it to always prefix `\`, disallowing the use of `redirector()->action(...)` because that is auto-stripped of `\`. This should be done at the group( ... ).

Personally, I think the auto stripping of `\` shouldn't be there. If I prepend with `\` I expect it to stay.
Merge pull request #5674 from ConnorVG/patch-1

fixes empty namespace error