chore(order): maintain use of backwards-compatible undefined check

Author: Xunnamius

src/rules/order.js

@@ -533,10 +533,10 @@ function computeRank(context, ranks, importEntry, excludedImportTypes, isSorting
     rank = computePathRank(ranks.groups, ranks.pathGroups, importEntry.value, ranks.maxPosition);
   }
 
-  if (rank === undefined) {
+  if (typeof rank === 'undefined') {
     rank = ranks.groups[impType];
 
-    if (rank === undefined) {
+    if (typeof rank === 'undefined') {
       return -1;
     }
   }