Fix assert with attribute + first-class callable in assert

This is going to result in a compile-time error, but AST printing
is invoked first and should handle it gracefully. Handle it b

Fix assert with attribute + first-class callable in assert

This is going to result in a compile-time error, but AST printing
is invoked first and should handle it gracefully. Handle it by
falling back to more generic printing code.

Fixes oss-fuzz #36264.

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