Description of problem:
When we create a hook and configure a executionNamespace with a forbidden name (with spaces, for instance) the migration plan show a critical condition. We cannot edit the migration plan to fix this error, since this critical condition breaks the edit screen before we can reach the hooks screen.

Version-Release number of selected component (if applicable):
CAM 1.2 stage

How reproducible:
Always

Steps to Reproduce:
1. Create a migration plan
2. In the hook screen click on "Add Hook"
3. Fill in the form, and in the field "Service account namespace" use a value with spaces, for instance at the beginning, like that: '     namespacewithspaces'
4. Click "Add hook" and "Finish"
5. The migration plan will show a critical condition
      message: The executionNamespace specified is invalid, DNS-1123 label regex used
        for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?'.
6. Click on "Edit" in order to edit the migration plan's problem with the executionNamespace value
7. Try to fix the value you entered in step 3

Actual results:
The edit screen will fail before you can reach the "hooks" screen to fix the wrong value.

Expected results:
We should be able to edit the plan and fix the wrong value that we used when we created the plan.

Additional info: