Fix for selectize#1594, optgroup may be undefined while sorting

Author: risadams

dist/js/selectize.js

@@ -1641,8 +1641,8 @@
 			// sort optgroups
 			if (this.settings.lockOptgroupOrder) {
 				groups_order.sort(function(a, b) {
-					var a_order = self.optgroups[a].$order || 0;
-					var b_order = self.optgroups[b].$order || 0;
+					var a_order = self.optgroups[a] && self.optgroups[a].$order || 0;
+					var b_order = self.optgroups[b] && self.optgroups[b].$order || 0;
 					return a_order - b_order;
 				});
 			}
@@ -1974,7 +1974,7 @@
 
 			return $();
 		},
-		
+	
 		/**
 		 * Finds the first element with a "textContent" property
 		 * that matches the given textContent value.

dist/js/selectize.min.js

@@ -1139,8 +1139,8 @@ $.extend(Selectize.prototype, {
 		// sort optgroups
 		if (this.settings.lockOptgroupOrder) {
 			groups_order.sort(function(a, b) {
-				var a_order = self.optgroups[a].$order || 0;
-				var b_order = self.optgroups[b].$order || 0;
+				var a_order = self.optgroups[a] && self.optgroups[a].$order || 0;
+				var b_order = self.optgroups[b] && self.optgroups[b].$order || 0;
 				return a_order - b_order;
 			});
 		}
@@ -1472,7 +1472,7 @@ $.extend(Selectize.prototype, {
 
 		return $();
 	},
-	
+
 	/**
 	 * Finds the first element with a "textContent" property
 	 * that matches the given textContent value.