Check that shared string segment is not an shared empty segment. This check allows to simplify client code and avoid potencial destruction of shared empty segment.
Check that shared string segment is not an shared empty segment. This
check allows to simplify client code and avoid potencial destruction of
shared empty segment.


git-svn-id: 84a7e9580ef41fb6fdf7e69fc6952b9cdfe895dd@654 661adc5f-87f8-0310-85d6-9a7b5f58d823

reznikmm/matreshka,reznikmm/matreshka,reznikmm/matreshka,reznikmm/matreshka,reznikmm/matreshka,reznikmm/matreshka