Related: #i125226# don't try to access known-bad DDE servers

(cherry picked from commit 88de6a59d9d7933b86fdcba733277aa4fbd5e132)

Conflicts:
	sfx2/source/appl/impldde.cxx

Change-Id: If4dcd49cfe15188d06e4e06cd8e58cdcc66ed5a4