Description of problem:
The dev console shows a list of samples. The user can create a sample based on a git repository. But some of these samples doesn't include a git repository reference and could not be created.

Version-Release number of selected component (if applicable):
Tested different frontend versions against a 4.11 cluster and all (oldest tested frontend was 4.8) show the sample without git repository.

But the result also depends on the installed samples operator and installed ImageStreams.

How reproducible:
Always

Steps to Reproduce:

1. Switch to the Developer perspective
2. Navigate to Add > All Samples
3. Search for Jboss
4. Click on "JBoss EAP XP 4.0 with OpenJDK 11" (for example)

Actual results:
The git repository is not filled and the create button is disabled.

Expected results:
Samples without git repositories should not be displayed in the list.

Additional info:
The Git repository is saved as "sampleRepo" in the ImageStream tag section.