Prevent Errorin console in participant detail view

[Elblinator]

Describe the bug
If you open a participant detail view then the following error is thrown in the console:

ERROR TypeError: this.personalInfoForm.controls.home_committee_id is undefined

The guest can also apparently thrown this error

How to Reproduce

1. login as some admin
2. open console
3. navigate into meeting > participant > participant detail
4. error is in console

Expected behavior
The error should not be thrown