[FIX] NoMatchesFound-dgd ( [er][et][sm][cd] works, but fixes suggested )

[germanmorales at delta-sys.com]

only 3 changes in one method:
-replaces the message #allSelectors with the deprecated
#allSelectorsUnderstood, why?

-and: [searchFor isEmpty not]
 this does the trick, works just right

-(addedMorphs isEmpty) replaced by (addedMorphs size = 0), why?