typeof(window.external.pageT) returns "unknown" instead of "undefined" for some versions of IE

[GoogleCodeExporter]

Certain versions of IE will return "unknown" instead of "undefined" for 
typeof(window.external.pageT). This will cause a JS error following the test on 
line https://code.google.com/p/episodes/source/browse/trunk/episodes.js#266

We've been able to reproduce that behavior on a machine with Windows XP and IE8 
8.0.6001.18702 (although 2 other machines with the same IE version didn't 
reproduce). But this behavior has been documented for IE when accessing objects 
via COM+ bridge: 
http://stackoverflow.com/questions/10982739/typeof-returning-unknown-in-ie

Original issue reported on code.google.com by fuch...@gmail.com on 9 Mar 2014 at 12:28