Description of problem:

When we try to edit a git application and add another subscription using a pre-exsiting URL, the branch field does an infinite load and does not take any input

Version-Release number of selected component (if applicable):

2.7.0

How reproducible:

Always

Steps to Reproduce:

1. Edit an existing single-subscription git application
2. Add another git repository and select a pre-existing URL
3. Observe the branch field

Actual results:

Branch field keeps loading and takes no input

Expected results:

Branch field should take input

Additional info: