error 500 when creating project (beta instance)

[mhow2]

I'm using beta.crossminer.org (it has been deployed from scratch about Tuesday by @blueoly)

When I create a project in the system like in the screenshot, and click "save" the button turns grey and in FF's dev pane I see an error 500...

[ambpro]

As in #409, the issue is due to unfilled mandatory field (executionFrequency). So, I pushed a fix (91b5350) to deal with that.

[creat89]

Well, I have tested a previous version of the platform and what it was happening is that if you left the Execution Frequency empty, the save button was active. But once you clicked on it, it became gray. Furthermore, even if you updated the Execution Frequency to a day, the button never changed back. In fact we needed to cancel the project creation and this time fill all the fields before clicking on save.

[ambpro]

@mhow2 @creat89 , could you check if the previous commits fix the current issue?