Steps:

1. ASSERT: make sure that you have a valid oc binary set in your preferences (Preferences > OpenShift > 'oc' executable location
2. EXEC: launch connection wizard (New > Other > OpenShift)
3. EXEC: hit "Advanced >>" & check "Override 'oc' location:"

Result:
The input field for "Override 'oc' location:" is decorated with a warning even though the path that is used (that is taken from necessarily valid preferences) is perfectly valid