[BUGFIX] phpcr value format change exception try to delete property and rewrite it

__Tasks:__

- [ ] test coverage
- [ ] gather feedback for my changes


__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | none
| Fixed tickets | #544
| BC Breaks     | no
| Doc           | none
this save is not in the content mapper its in an contentType.
does the preview never used the write function of an content type to set the data? 
How else the data is set correctly for the content type when not using write?