handle empty variants explicitly

Author: fhennig

website/src/components/views/wasap/useWasapPageData.ts

@@ -156,6 +156,11 @@ async function fetchCollectionModeData(
         queryString: string;
     }[] = [];
 
+    const invalidVariants: {
+        name: string;
+        error: string;
+    }[] = [];
+
     for (const variant of collection.variants) {
         let queryString: string;
         switch (variant.query.type) {
@@ -168,6 +173,13 @@ async function fetchCollectionModeData(
                 break;
             }
         }
+        if (queryString === '') {
+            invalidVariants.push({
+                name: variant.name,
+                error: 'Variant is empty.',
+            });
+            continue;
+        }
         variantData.push({
             name: variant.name,
             queryString: queryString,
@@ -187,11 +199,6 @@ async function fetchCollectionModeData(
         coverageQuery: string;
     }[] = [];
 
-    const invalidVariants: {
-        name: string;
-        error: string;
-    }[] = [];
-
     variantData.forEach(({ name, queryString }, index) => {
         const parseResult = parseResults[index];