Fix catalog item delete when part of catalog bundle

[mzazrivec]

1. Create catalog item catalog01
2. Create catalog bundle bundle01 with catalog01 in it
3. Try to delete catalog01 in UI

Previously, the UI would report successful deletion, although in truth no deletion would take place. In this particular case, for the delete request the API returns http/200 and the following JSON:

{"success":false,"message":"Cannot delete a service that is the child of another service."}

so we need to adjust our code accordingly.

With the proposed fix in place:

https://bugzilla.redhat.com/show_bug.cgi?id=1356086

[miq-bot]

Checked commit mzazrivec@bb0162c with ruby 2.4.6, rubocop 0.69.0, haml-lint 0.20.0, and yamllint 1.10.0
0 files checked, 0 offenses detected
Everything looks fine. 🍪