Add note and print statement to describe function's behavior

[rouille]

Pull Request doc

Purpose

Add note and print statement in the sum_generation_by_type_zone function. Closes issue #339.

What the code is doing

Add a print statement if a condition is not met on parameter setting.

Testing

New unit test

Where to look

• new if statement in function
• new test checking that the print statement is well triggered

Usage Example/Visuals

N/A

Time estimate

5min