Reverting incorrect refactoring changes
Reverting incorrect refactoring changes

Refactoring commit feb13a0f introduced a few errors that cause the Customize tab dialogs fields to not be populated when selecting a spec.

1. Changed `unless` to `if` without reversing condition logic
2. Removed `unless cs_data.nil?` which changed logic flow
3. Changed to use guard clause without properly updating condition logic

Discovered which debugging
https://bugzilla.redhat.com/show_bug.cgi?id=1220815

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