validation on uuids

[peterdudfield]

Detailed Description

It would be good to check the list of uuid is in the correct format

Context

• good to have useful error messages
• on forecast and generation gets

Possible Implementation

• add method to check list of uuids
• return 204 if empty
• return 404 if error with useful message
• option to strip front and back brackets of string

[peterdudfield]

Also good option to strip string of spaces