MacOS is not guaranteed to use major.minor.patch versions anymore. Handle it. (spacetelescope#571)

Co-authored-by: mdlpstsci <[email protected]>

Author: jhunkeler

wscript

@@ -329,7 +329,13 @@ def _check_mac_osx_version(floor_version):
         return None
 
     # Extract the integer values between the '.'s
-    osx_version_major, osx_version_minor, osx_version_patch = tuple(int(x) for x in s.strip().split('.'))
+    osx_version_data = tuple(int(x) for x in s.strip().split('.'))
+    osx_version_major = osx_version_data[0]
+    osx_version_minor = osx_version_data[1]
+    osx_version_patch = 0
+
+    if len(osx_version_data) > 2:
+        osx_version_patch = osx_version_data[2]
 
     # Convert major/minor/patch values into a single 24-bit integer
     osx_version = (osx_version_major & 0xff) << 16 | (osx_version_minor & 0xff) << 8 | (osx_version_patch & 0xff )