Datepicker: modified a catch variable to no longer mask an existing v…

…ariable in scope. Fixed #8138 - datepicker: IE8 does not create a new scope for catch blocks and will cause

ui/jquery.ui.datepicker.js

@@ -620,8 +620,8 @@ $.extend(Datepicker.prototype, {
 					$.datepicker._updateDatepicker(inst);
 				}
 			}
-			catch (event) {
-				$.datepicker.log(event);
+			catch (err) {
+				$.datepicker.log(err);
 			}
 		}
 		return true;