try/catch'ing our audio/video tests, as IE9 likes to throw exceptions…

… in some rare cases. details:

it seems that if you don't have the "Desktop Experience" installed, using elem.canPlayType()
will throw an exception. Awesome!

So we try/catch it. It's okay, they're cheap.

I'm doing a little bit of magic with an assignment inside my if() conditional. I hope nobody minds, too much.

Fixes Modernizr#224

modernizr.js

@@ -656,37 +656,45 @@ window.Modernizr = (function( window, document, undefined ) {
 
     tests['video'] = function() {
         var elem = document.createElement('video'),
-            bool = !!elem.canPlayType;
-
-        if ( bool ) {
-            bool      = new Boolean(bool);
-            bool.ogg  = elem.canPlayType('video/ogg; codecs="theora"');
+            bool = false;
+
+        // IE9 Running on Windows Server SKU can cause an exception to be thrown, bug #224
+        try {
+            if ( bool = !!elem.canPlayType ) {
+                bool      = new Boolean(bool);
+                bool.ogg  = elem.canPlayType('video/ogg; codecs="theora"');
 
-            // Workaround required for IE9, which doesn't report video support without audio codec specified.
-            //   bug 599718 @ msft connect
-            var h264 = 'video/mp4; codecs="avc1.42E01E';
-            bool.h264 = elem.canPlayType(h264 + '"') || elem.canPlayType(h264 + ', mp4a.40.2"');
+                // Workaround required for IE9, which doesn't report video support without audio codec specified.
+                //   bug 599718 @ msft connect
+                var h264 = 'video/mp4; codecs="avc1.42E01E';
+                bool.h264 = elem.canPlayType(h264 + '"') || elem.canPlayType(h264 + ', mp4a.40.2"');
 
-            bool.webm = elem.canPlayType('video/webm; codecs="vp8, vorbis"');
-        }
+                bool.webm = elem.canPlayType('video/webm; codecs="vp8, vorbis"');
+            }
+
+        } catch(e) { }
+
         return bool;
     };
 
     tests['audio'] = function() {
         var elem = document.createElement('audio'),
-            bool = !!elem.canPlayType;
-
-        if ( bool ) {
-            bool      = new Boolean(bool);
-            bool.ogg  = elem.canPlayType('audio/ogg; codecs="vorbis"');
-            bool.mp3  = elem.canPlayType('audio/mpeg;');
-
-            // Mimetypes accepted:
-            //   https://developer.mozilla.org/En/Media_formats_supported_by_the_audio_and_video_elements
-            //   http://bit.ly/iphoneoscodecs
-            bool.wav  = elem.canPlayType('audio/wav; codecs="1"');
-            bool.m4a  = elem.canPlayType('audio/x-m4a;') || elem.canPlayType('audio/aac;');
-        }
+            bool = false;
+
+        try { 
+            if ( bool = !!elem.canPlayType ) {
+                bool      = new Boolean(bool);
+                bool.ogg  = elem.canPlayType('audio/ogg; codecs="vorbis"');
+                bool.mp3  = elem.canPlayType('audio/mpeg;');
+
+                // Mimetypes accepted:
+                //   https://developer.mozilla.org/En/Media_formats_supported_by_the_audio_and_video_elements
+                //   http://bit.ly/iphoneoscodecs
+                bool.wav  = elem.canPlayType('audio/wav; codecs="1"');
+                bool.m4a  = elem.canPlayType('audio/x-m4a;') || elem.canPlayType('audio/aac;');
+            }
+        } catch(e) { }
+
         return bool;
     };