Revert "Don't throw error if gems param is omitted" until some tests are in place for this
Revert "Don't throw error if gems param is omitted" until some tests are
in place for this

This reverts commit 3d367904b3e9fe341c37b349630c27c581f127fb.

1337807/rubygems.org,square/rubygems.org,1337807/rubygems.org,dstrctrng/private_event,rubygems/rubygems.org-backup,1337807/rubygems.org,square/rubygems.org,rubygems/rubygems.org-backup,rubygems/rubygems.org-backup,dstrctrng/private_event,square/rubygems.org,bpm/getbpm.org,bpm/getbpm.org