Description of problem:

Version-Release number of selected component (if applicable):
Satellite 6.14.0 Snap 9.0

How reproducible:
Always

Steps to Reproduce:
1. Enable puppet on Satellite 6.14
2. Create config group with some puppet_classes assigned
3. Click on the config group created from all page.

Actual results:
Oops, we're sorry but something went wrong undefined method "environment' for #‹ForemanPuppet:ConfigGroup:0x0000555d6a93b90

Expected results:
ConfigGroup Edit page should be visible

Additional info:
Same works for 6.13, so adding a `Regression` keyword