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(parent: fe5e3fc) | patch

Change various deparsing functions to return NULL for invalid input.

Change various deparsing functions to return NULL for invalid input.

Previously, some functions returned various fixed strings and others
failed with a cache lookup error. Per discussion, standardize on
returning NULL. Although user-exposed "cache lookup failed" error
messages might normally qualify for bug-fix treatment, no back-patch;
the risk of breaking user code which is accustomed to the current
behavior seems too high.

Michael Paquier

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