[CBBS] Users can create "empty" plans with no tasks

What's happening?

If a plan is created with no body, an "empty" plan is created that has no tasks and does nothing.

What is expected?

I would not expect a plan like this to be created, I can't think of a reason to have an empty plan.

Perhaps a warning could be given, or the plan tagged as empty to ensure a user doesn't mistakenly use it instead of a normal plan.

Steps to reproduce

In CBBS WebUI:

1. Go to Add Plan
2. Enter a name and nothing else
3. Click Add Plan
4. Task should appear with no body
5. 

This can also be done through the API