Use raw image format by default for block devices #4042
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Not providing a default behavior leads to use of variable without a value and thus cryptic errors regarding the simple fact that we have to provide an image format. It is also not recommended in any conditionals as it leads to undefined behaviors. Finally, in the case of multiple images we may have "image_format=" to use empty string which should be handled similarly to None (lack of any image_format parameter) or generally as the comment suggests to a meaningful default behavior.