"Challenge" button should remain disabled until a project is selected

[nieldlr]

Hiya team,

I found an error/bug in the validation as part of the Challenge flow.

When you go to challenge a project, you are asked to select a project. Initially I was unsure if I needed to select that & went straight to writing the reason for a challenge. The "Challenge" button then became enabled & I clicked it to go ahead with the challenge. I assumed with this flow the project field was not required.

Once you click the button, it shows the "Waiting for transaction" screen for short while & then the transaction/flow fails & resets without a reason why.

Perhaps it would be better to explain that the Project field is definitely required & also prevent the "Challenge" button from becoming enabled if that field is missing.