Fixed bug without [] in label url

ee/app/assets/javascripts/roadmap/mixins/filtered_search_mixin.js

@@ -220,6 +220,7 @@ export default {
       }
 
       if (labelName?.length) {
+        if (Array.isArray(labelName)) {
           filteredSearchValue.push(
             ...labelName.map((label) => ({
               type: 'label_name',
@@ -227,6 +228,12 @@ export default {
             })),
           );
         }
+      } else {
+        filteredSearchValue.push({
+          type: 'label_name',
+          value: { data: labelName, operator: OPERATOR_IS },
+        });
+      }
       if (notLabelName?.length) {
         filteredSearchValue.push(
           ...notLabelName.map((label) => ({