Check for empty closures

Merged Emmanuele Bassi requested to merge ebassi/closure-check into master

The closure field of the callback info structure can be NULL, which means we need to check before calling functions on it.

Fixes: https://rt.cpan.org/Public/Bug/Display.html?id=147409

Closes: #4 (closed)

Edited by Emmanuele Bassi

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