asdf-install patch to improve error message when GPG is not found

I'm not sure who is maintaining asdf-install but the following patch  
improves the error message when GPG isn't installed or isn't found  
when verify-gpg-signature/string calls make-stream-from-gpg-command  
to do its stuff.	If anyone knows of a better place to post this,  
please let me know.

It just adds a condition and a check that the putative call to GPG  
returned something that looks like it came from GPG <smile>.

196a197,202
 > (define-condition shell-error (error)
 >   ()
 >   (:report (lambda (c s)
 >              (declare (ignore c))
 >              (format s "Call to GPG failed. Perhaps GPG is not  
installed or not in the path."))))
 >
401a408,412
 >
 >     ;; test that command returned something
 >     (when (null tags)
 >       (error 'shell-error))
 >

-- 
Gary Warren King
metabang.com
http://www.metabang.com/

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