Fix: manual metadata null values for strings

[CKY-]

Co-authored-by: DennisRijsdijk dennisrijsdijk@users.noreply.github.com

Description of the Change

some scripts would try to use null as a manualMetadata
resulting in error

Uncaught (in promise) TypeError: Cannot read properties of null (reading 'type')
    at simulateGroupEventsModal.js:101:71
    at Array.map (<anonymous>)
    at $ctrl.eventChanged (simulateGroupEventsModal.js:97:82)

this change trys to help alleviate that but will fail with nulled type objects

as illustrated in this screenshot campaign info is empty
and to be clear i do not have tiltify configured so that may change

Applicable Issues

#2647

Testing

this was loaded with the tiltafy script and tested as its the only offended script that could be found

Screenshots