Fix for situations where contour points may have 1 or 2 contour points only #134
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Add support for contours with fewer than 3 points by drawing circles for single-point contours and lines for two-point contours, instead of attempting to fill them as polygons which would fail.
Handle single and two-point contours in slice mask generation
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When a RTStructureset has a single or two contour points a polygon cannot be drawn. This is technically a correct dicom so we do not want to delete these points. This fix allows the contour points to be represented by a circle of 2 pixels if there is a single point and a line if there are 2 points. For 3 or more points it will create the polygon as was done previously.