What/Where is the issue ?

// Brief explanation of the issue

Environment: C8SaaS

Optimize version : 3.10 and 3.11 (just the current one on master)
ES version : 7.17
OS + Browser version : chrome:latest

Steps to reproduce:

• Preconditions: there has to be at least one process so we can create report for it
• Steps:
  • create collection
  • create report within this collection
  • create alert for this report in collection's alert tab
  • use some non existing email address
  • try to create this alert

Observed behavior:

Screen becomes completly white

Expected behavior:

Error message is displayed and optimize is still running properly

Additional Information:

After investigation this is caused by the backend not returning in the error response the expected invalidAlertEmails  property wit an array of emails