[cfe-dev] StmtPrinter: check Qualifier != NULL even for DependentScopeDeclRefExp

[Axel Naumann]

Hi,

Currently, StmtPrinter assumes that a DependentScopeDeclRefExpr it
visits has a valid NestedNameSpecifier qualifier. Our artificially
dependent nodes (for introducing dynamic scopes) don't have a
NestedNameSpecifier, but we would like to survive printing the AST
nevertheless.

Can I commit the attached, tiny, innocent additional check?

Cheers, Axel.
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