selinux: Fix uncaught exception with old setroubleshoot-server
selinux: Fix uncaught exception with old setroubleshoot-server

Otherwise the Delete button is not disabled for old
setroubleshoot-server. And we see an Ooops exception thrown when
the Delete button is clicked.

Closes #4513
Reviewed-by: Dominik Perpeet <f7830b2723a5db4fc185058b06cfab4b89a38da9@redhat.com>

martinpitt/cockpit,larsu/cockpit,michalskrivanek/cockpit,moraleslazaro/cockpit,xhad/cockpit,SotolitoLabs/cockpit,mareklibra/cockpit,larsu/cockpit,michalskrivanek/cockpit,Scribery/cockpit,michalskrivanek/cockpit,harishanand95/cockpit,stefwalter/cockpit,harishanand95/cockpit,garrett/cockpit,petervo/cockpit,stefwalter/cockpit,michalskrivanek/cockpit,harishanand95/cockpit,dperpeet/cockpit,Scribery/cockpit,deryni/cockpit,xhad/cockpit,martinpitt/cockpit,stefwalter/cockpit,vanloswang/cockpit,mareklibra/cockpit,larskarlitski/cockpit,stefwalter/cockpit,andreasn/cockpit,stefwalter/cockpit,andreasn/cockpit,moraleslazaro/cockpit,larskarlitski/cockpit,garrett/cockpit,mvollmer/cockpit,larskarlitski/cockpit,dperpeet/cockpit,sgallagher/cockpit,mareklibra/cockpit,andreasn/cockpit,vanloswang/cockpit,deryni/cockpit,deryni/cockpit,andreasn/cockpit,xhad/cockpit,petervo/cockpit,larsu/cockpit,arilivigni/cockpit,michalskrivanek/cockpit,deryni/cockpit,Scribery/cockpit,cockpituous/cockpit,cockpit-project/cockpit,xhad/cockpit,cockpituous/cockpit,dperpeet/cockpit,petervo/cockpit,sgallagher/cockpit,vanloswang/cockpit,cockpituous/cockpit,xhad/cockpit,moraleslazaro/cockpit,SotolitoLabs/cockpit,dperpeet/cockpit,cockpit-project/cockpit,larsu/cockpit,SotolitoLabs/cockpit,harishanand95/cockpit,arilivigni/cockpit,sgallagher/cockpit,mvollmer/cockpit,xhad/cockpit,cockpituous/cockpit,andreasn/cockpit,larskarlitski/cockpit,cockpituous/cockpit,sgallagher/cockpit,SotolitoLabs/cockpit,Scribery/cockpit,arilivigni/cockpit,petervo/cockpit,Scribery/cockpit,larsu/cockpit,harishanand95/cockpit,martinpitt/cockpit,sgallagher/cockpit,SotolitoLabs/cockpit,larskarlitski/cockpit,vanloswang/cockpit,harishanand95/cockpit,garrett/cockpit,petervo/cockpit,cockpituous/cockpit,dperpeet/cockpit,arilivigni/cockpit,deryni/cockpit,arilivigni/cockpit,sgallagher/cockpit,sgallagher/cockpit,martinpitt/cockpit,mvollmer/cockpit,petervo/cockpit,arilivigni/cockpit,moraleslazaro/cockpit,harishanand95/cockpit,stefwalter/cockpit,larskarlitski/cockpit,Scribery/cockpit,larsu/cockpit,dperpeet/cockpit,moraleslazaro/cockpit,SotolitoLabs/cockpit,martinpitt/cockpit,mareklibra/cockpit,vanloswang/cockpit,stefwalter/cockpit,mareklibra/cockpit,garrett/cockpit,michalskrivanek/cockpit,petervo/cockpit,andreasn/cockpit,Scribery/cockpit,dperpeet/cockpit,andreasn/cockpit,mareklibra/cockpit,cockpit-project/cockpit,arilivigni/cockpit,mvollmer/cockpit,deryni/cockpit,vanloswang/cockpit,larskarlitski/cockpit,vanloswang/cockpit,moraleslazaro/cockpit,SotolitoLabs/cockpit,cockpit-project/cockpit,mareklibra/cockpit,xhad/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,mvollmer/cockpit,garrett/cockpit,deryni/cockpit,michalskrivanek/cockpit