Open PDF without ghostscript installed fail silently

[iurisilvio]

with WandImage(filename=pdf_filename) as pdf_file:
    # pdf_file has no pages here, but no exception

It was fixed after I installed ghostscript, but an exception would have saved some time.

[acmujica]

It no longer fails silently but when I was trying to do this there was no error saying I needed ghostcript. Thanks for this comment I've been searching how to make it work for a couple hours now.

[blodone]

<wand.image.Image: (empty)> is the result... error or warning would be better... "apt-get install ghostscript" fixed it

[emcconville]

Added generic exception if ImageMagick doesn't emit one. Hope it save someone in the future some time.