Created attachment 4061 [details]
screenshot

STATUS: FAILED
BUILD: 2.4 M4: rc1-592c3449697ce39bf07864fafd7f0a61ca230561
ENVIRONMENT: Fedora 26
STEPS TO REPRODUCE: 
       1. Access a project page, either by creating a new project or accessing an existing project from the "All projects" table.

    2. On the project page click on the "New custom image" link situated on the left-hand side  
  3. Click on button create custom image without name and it will change to creating custom image
4. write an image recipe example core-image-sato
5. It says "an image with this name already exists. Image name must be unique.
6. Press the button create custom image

EXPECTED OUTCOME: You couldn't press the button because the name is not unique, it has to be disabled.