Fix .trim() on null in conformance cases getter and add fallback returns

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/stores/conformance.ts

@@ -182,7 +182,7 @@ export const useConformanceStore = defineStore("conformanceStore", {
                     ? abbreviateNumber(new Decimal(v.toFixed(2)))
                     : null,
                 );
-                copy.value = copy.value.map((v) => v.trim()).join(", ");
+                copy.value = copy.value.map((v) => (v ?? "").trim()).join(", ");
                 break;
               default:
                 break;
@@ -218,6 +218,7 @@ export const useConformanceStore = defineStore("conformanceStore", {
           };
         });
       }
+      return [];
     },
     loopTraces: (state) => {
       return state.allLoopTraces;
@@ -256,6 +257,7 @@ export const useConformanceStore = defineStore("conformanceStore", {
           };
         });
       }
+      return [];
     },
   },
   actions: {