[update 2.0] #20590

20590
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Issue 7345: DNU with Glamour: PaginatedMorphTreeMorph>>setSelectedMorph:
        https://code.google.com/p/pharo/issues/detail?id=7345
        https://pharo.fogbugz.com/f/cases/7282
       
Diff information:
http://ss3.gemstone.com/ss/Pharo20/Morphic-EstebanLorenzano.1372.diff