This is relevant for paragraph signatures where the
metadata is not yet copied and so we exclude it.
The issue was that in some cases we didn't use
the proper range of text and an assertion was
triggered in debug builds.

Otherwise there should be no change of behavior
in release builds with this patch.

Change-Id: I90bc2ca56d586b96d39f34c68de53d3dac6099d7
Reviewed-on: https://gerrit.libreoffice.org/63000
Tested-by: Jenkins
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>