Revert "sniffer warnings" from okredo

This reverts commit 4c2a3bdc4ed9b1dd9d4638c266ec6ff7f50053dc.
explicitly return an empty string
allow anchor-related html through for the recurly user link; see https://github.com/GigaOM/legacy-pro/issues/4406
reverted the revert of 6966e97608dae2e16b3c28f3fe4f48a07de26d01: it turns out it was caused by missing allowed html to the wp_kses() call
Merge pull request #32 from wluo/github-4406

fixed broken recurly user link on the user admin dashboard page
Merge branch 'master' of github.com:GigaOM/go-recurly into freebird-v2