Fix issue with 500 response when new event/era sent without color

[leahriffell]

For some reason the create event and era are requiring FE to send a color, even just an empty string in order to get a response. *NOTE this is only when sending as variables (like the FE will be sending). If hard coding the variables in Postman, there's no issue.

It doesn’t give a helpful error, just 500. Something we did with the set_color is messing up this request as it was working properly before then. As a bandaid, they will create a new era/event color w/ a blank string