[BUGFIX] Fixes array_key_exists(): Argument #1 ($key) must be a valid… #470
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… array offset type
Fixes the error
array_key_exists(): Argument #1 ($key) must be a valid array offset type
This error occurs, for example, when the SaveToDatabase finisher tries to map a field with the name "type". In
transformMultiValuePropertiesForFormEditor
there is no check as to whether the form element type determined there is actually an identifier (string) or not.