Fix bug 438964 (again) - Closing Edit Event window without modifications prompts Save Event dialog if event is on a remote calendar and it wasn't saved twice.. r=dbo

git-svn-id: svn://10.0.0.236/trunk@254226 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/calendar/base/src/calItemBase.js

@@ -415,7 +415,7 @@ calItemBase.prototype = {
         } else {
             this.modify();
         }
-        if (aValue) {
+        if (aValue || !isNaN(aValue)) {
             this.mProperties.setProperty(aName.toUpperCase(), aValue);
         } else {
             this.deleteProperty(aName);