Saving session and speaker fails if created before addition of custom form

[iamareebjamal]

If a speaker or session was created before addition of a required custom form, then it is impossible to send a PATCH request to edit them since new required field is not present in the request. So, custom form required checks must only be applied if either speaker or session is being created or custom form values are present in the PATCH request

[iamareebjamal]

In a PATCH request:

• If complex field values are present
  • Apply validation
• If complex field values are null or {}
  • Apply validation if previously there were complex field values assigned
• If complex field values are absent
  • Don't apply validation

[iamareebjamal]

It is becoming more and more complicated just for the sake of allowing organizer to edit status.

I think it's better if we allow organizers to edit session as they see fit and apply normal validations for speakers