Add null coalescing for facets and attributes access in MoreModal

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

src/components/Discover/Conformance/MoreModal.vue

@@ -214,11 +214,11 @@ const columnData = computed(() => {
     { field: "id", header: "Case Id" },
     { field: "started_at", header: "Start time" },
     { field: "completed_at", header: "End time" },
-    ...data[0].facets.map((fac, index) => ({
+    ...(data[0].facets ?? []).map((fac, index) => ({
       field: `fac_${index}`,
       header: facetName(fac.name),
     })),
-    ...data[0].attributes.map((att, index) => ({
+    ...(data[0].attributes ?? []).map((att, index) => ({
       field: `att_${index}`,
       header: att.key,
     })),