[FIX] iam.physical returns nan for aoi > 90° when n = 1 (#1706)#1707

kandersolar merged 5 commits intopvlib:mainpvlib/pvlib-python:mainfrom

kdebrab:1706_iam_physical_nan_for_n1kdebrab/pvlib-python:1706_iam_physical_nan_for_n1Copy head branch name to clipboard