Fix issue #1856

Closed Bitbucket Importer requested to merge bitbucket/declined-pr-275 into branch/default

Created originally on Bitbucket by dripton (David Ripton)

Changesets for this Pull Request have not been imported, because it had been already declined on Bitbucket. Marked as closed by the import user.

initpath.find_executable bug caused by not skipping null directory names.

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