The option to add a new Cost plan in the IDEA isn't available.
Steps to Reproduce:
1. Navigate to Modern UX -> Ideas and remove value for Finish date.
2. Navigate to Modern UX -> Ideas -> Financials tab
3. It is noticed that cost plan instances are not shown and also + is missing to create new one.
Expected Results: User should see 'toast' message appear letting them know that either Start or Finish dates are not filled in.
Actual Results: User does not see any messages and no cost plan can be seen as well as new cost plan also can not be created.
This is reviewed and tracked as DE78259