[uploader] Resizing non-uploaded image caused fatal error

Imported from: http://groups.google.com/group/in-portal-bugs/browse_thread/thread/0d584d8d67e44e43#

When image upload isn't required then this means that there are no 100% guarantee that image will be there.

For such cases in template, where image will be displayed we:

• either display default image, e.g. <inp2:unit-prefix_Field name="ImageField" format="resize:100x100;default:img/no_image.gif"/>
• or place <inp2:m_if check="unit-prefix_Field" name="ImageField" db="db"> ... </inp2:m_if> around image display code

If none of mentioned above happens then horrible fatal error happens, that results in "*The connection was reset*" message being returned from a web server with no idea about what caused it.

missing_image_results_in_fatal_error.patch

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