[osg-submissions] bug fix in osgUtil::UpdateVisitor

[Gerben de Vries]

If a node has a callback function, the update visitor will skip the
entire subgraph. By removing an 'else' keyword, this incorrect
behaviour is fixed.
I fixed this bug because my program wasn't doing what it was supposed
to (the subgraph callbacks weren't called), after the fix the program
worked as it should.

In revision 8541.
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