if editor recive a value like '<span class="platzhalter">Empfaenger_Debitor</span>'
by rendering console show this error
core.js:15724 ERROR TypeError: Cannot read property 'split' of null
at utils.js:181
at Array.map (<anonymous>)
at getUniqueStyleValues (utils.js:200)
at SafeSubscriber._next (index.js:1810)
at SafeSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.SafeSubscriber.__tryOrUnsub (Subscriber.js:194)
at SafeSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.SafeSubscriber.next (Subscriber.js:132)
at Subscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._next (Subscriber.js:76)
at Subscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.next (Subscriber.js:53)
at BehaviorSubject.push../node_modules/rxjs/_esm5/internal/Subject.js.Subject.next (Subject.js:47)
at BehaviorSubject.push../node_modules/rxjs/_esm5/internal/BehaviorSubject.js.BehaviorSubject.next (BehaviorSubject.js:38)