Issue #3267136 by steveoriol, shagel, chr.fritsch, volkerk: Uncaught...

Issue #3267136 by steveoriol, shagel, chr.fritsch, volkerk: Uncaught TypeError: deltaInput is null after update to paragraphs 1.13

* Issue #3267136 by shagel: Uncaught TypeError: deltaInput is null after update to 8.x-1.13

* Fix tests

* fix: another test

* fix: split text

Co-authored-by: Volker Killesreiter <killesre@gmail.com>
Co-authored-by: Christian Fritsch <chr.fritsch@gmx.net>