Update control.js (#554)

* Update control.js

fix out of bounds error when a click occurs at the end of the line

* Fix code style

* Update control.js

Author: st1gok

src/control.js

@@ -220,7 +220,9 @@
 
 		_hookEvents: function(l) {
 			l.on('linetouched', function(e) {
-				this._plan.dragNewWaypoint(e);
+				if (e.afterIndex < this.getWaypoints().length - 1) {
+					this._plan.dragNewWaypoint(e);
+				}
 			}, this);
 		},