Refer to the attached project that illustrates the issue.
PdfPageFacade throws a more informative exception when 0 (or another incorrect index) is passed as the "pageNumber" parameter to the to the AddRubberStampAnnotation method.
PdfPageFacade throws NullReferenceException when 0 is passed as the "pageNumber" parameter to the to the AddRubberStampAnnotation method.
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