[asdf-devel] contradiction in ASDF central-registry default vs code

The default for ASDF's *central-registry* in SBCL contains a (let (...) (when ...)) which can and *will* return NIL in some cases (i.e. when an executable SBCL image is run).

On the other hand, sysdef-central-registry-search calls directory-pathname-p on each entry, which assumes that NIL is an invalid entry.

My proposed solution: directory-pathname-p should check that its argument is indeed a pathname designator.

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