Bug 228510 Warning ``function getContentTypeFromHeaders does not always return a value'' [xs] in file ``chrome://navigator/content/pageInfo.js'', line 951, character 0.

r=neil sr=bz

suite/browser/pageInfo.js

@@ -944,6 +944,7 @@ function getContentTypeFromHeaders(cacheEntryDescriptor)
     match = /^Content-Type:\s*(.*?)\s*(?:\;|$)/mi.exec(headers);
     return match[1];
   }
+  return "";
 }
 
 function getContentTypeFromImgRequest(item)