Fix for Issue 1179: Call to eventElement.draggable() in draggableDayEvent() throws exception

src/agenda/AgendaEventRenderer.js

@@ -357,6 +357,8 @@ function AgendaEventRenderer() {
 	// when event starts out FULL-DAY
 	
 	function draggableDayEvent(event, eventElement, isStart) {
+		if (!eventElement.draggable)
+			return;	
 		var origWidth;
 		var revert;
 		var allDay=true;

src/basic/BasicEventRenderer.js

@@ -96,6 +96,9 @@ function BasicEventRenderer() {
 	
 	
 	function draggableDayEvent(event, eventElement) {
+		if (!eventElement.draggable)
+			return;	
+			
 		var hoverListener = getHoverListener();
 		var dayDelta;
 		eventElement.draggable({