Wizard: Invalid values are not obvious on import

[regexowl]

The error icon doesn't appear next to the step name if the step was skipped on import.

How to reproduce:

1. import toml blueprint with invalid hostname like "-base-image-"
2. select a target and click next
3. click "Review and finish" button

Outcome:

• hostname step doesn't have error icon next to its name in the left side navigation, the "Create blueprint" button is disabled without any indication why

Expected outcome:

• hostname step has the error icon next to its name

There might a problem with the pristine status of the navigation item, if clicked after skipping to review the validation gets applied properly and clicking away with invalid value adds the error icon immediately.