Rebases stuff from associations to check undefind/null

index.js

@@ -239,22 +239,22 @@ var compare = {
 
 // Prepare two values for comparison
 function normalizeComparison(a,b) {
+
+  if(_.isUndefined(a) || a === null) a = '';
+  if(_.isUndefined(b) || b === null) b = '';
+
   if (_.isString(a) && _.isString(b)) {
     a = a.toLowerCase();
     b = b.toLowerCase();
   }
-
-
+
   // Stringify for comparisons- except for numbers, null, and undefined
   if (!_.isNumber(a)) {
-    a = a.toString();
+    a = typeof a.toString !== 'undefined' ? a.toString() : '' + a;
   }
-  else if (_.isNull(a) || _.isUndefined(a)) {}
-
   if (!_.isNumber(b)) {
-    b = b.toString();
+    b = typeof b.toString !== 'undefined' ? b.toString() : '' + b;
   }
-  else if (_.isNull(b) || _.isUndefined(b)) {}
 
 
   return [a,b];