Allow for opening files with imageMagick warnings

[GoogleCodeExporter]

What steps will reproduce the problem?
1.Choose a jpg image which opens under ImageMagick with a warning
2. Open it with photivo, eg, photivo -i ~bad.jpg

What is the expected output? What do you see instead?
Desired output is that file opens, even though there is a warning.
See this URI for explanation of ImageMagick warnings:
http://www.imagemagick.org/script/exception.php

What happens is that the file fails to open with the message:
File not found!
The file is actually found.


What version of the product are you using? On what operating system?
I am using changeset:   999:d1d0953597b2
on Ubuntu 13.04




Please provide any additional information below.
I have a patch under this clone of the code:
hg clone https://[email protected]/r/nereocystiskevin-warning/

Original issue reported on code.google.com by [email protected] on 16 Jun 2013 at 2:17

[GoogleCodeExporter]

Here is a sample jpeg file which cannot be opened by photivo, because of an 
ImageMagick warning. With this fix, the file can be opened.

http://www.flickr.com/photos/56789206@N08/10933091796/sizes/o/

Original comment by [email protected] on 18 Nov 2013 at 9:58