Don't crash on files with no Hough lines #10
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If no lines are detected, `detect_skew` returns `{"Image File": img_file, "Message": "Bad Quality"}`, which then crashes `deskew` as the key `Estimated Angle` can not be found. Simple fix to propose a default value.
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If no lines are detected,
detect_skewreturns{"Image File": img_file, "Message": "Bad Quality"}, which then crashesdeskewas the keyEstimated Anglecan not be found. Simple fix to propose a default value.