Description of problem:
Permission error caused by trying to open details of a package on the removal confirmation page if the package is not synced (i.e. not clickable in the original package list)

Version-Release number of selected component (if applicable):
Reproduced both on 5.8 and 5.7, probably everywhere

How reproducible:
Deterministic

Steps to Reproduce:
1. Have a system registered with some packages installed that are not synced in a satellite
2. Go ty Systems -> <system> -> Software -> Packages -> List/Remove
3. The non-synced package should not be clickable
4. Select it and click Remove Packages
5. On the confirmation page, the package is now shown as clickable. Click it.
6. Permission error

Actual results:
Permission error

Expected results:
Not sure. The package is not synced. But permission error is not cool.

Additional info:
catalina.out log with traceback attached