Currently the front-end has a validation while creating a tester that disallows the Save button when the field Function is not set. The same check should be there for Implementations.

Steps to replicate

• Go to Create ZObject page and create an Implementation
  • E.g. or go directly to: https://wikifunctions.beta.wmflabs.org/wiki/Special:CreateZObject?zid=Z14&view=zobject-editor
• Do not select a function yet
• On the label box of the page, fill up the Label field

Observed behavior

• The "Publish" button is enabled.

Expected behavior

• The "Publish" button should not be enabled if there's no selected function in the "function:" field.
• While creating a Tester, until a function is selected on the "function:" field the "Publish" will not be enabled:
  • E.g. https://wikifunctions.beta.wmflabs.org/wiki/Special:CreateZObject?zid=Z20&view=zobject-editor