there is no GLOBAL_CONTENT_TEXT icon

avoid broken image in navigator in master document view

(cherry picked from commit faa18e9b19e52b611f77ba3ea9818c267ad2346f)

Conflicts:
	sw/source/uibase/utlui/glbltree.cxx

Change-Id: I329e12c3c8bc32781340a164213aaf3e4958d4b3
Reviewed-on: https://gerrit.libreoffice.org/11130
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>