Resizing non-uploaded image caused fatal error

[Alexander Obuhovich]

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.

Task: http://tracker.in-portal.org/view.php?id=1392

Ready for testing.

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