Fixes #6390/BZ1095098 - disabled table actions if no rows are selected.

This commit disables all table actions across the application if no rows are selected.

http://projects.theforeman.org/issues/6390
https://bugzilla.redhat.com/show_bug.cgi?id=1095098
There wasn't one for `removeRules()` prior to this change but I will add one for both of these methods.