fix: handle empty metaculus prediction

src/backend/platforms/metaculus/api.ts

@@ -49,7 +49,8 @@ const predictableProps = {
   community_prediction: {
     properties: {
       full: {
-        properties: {
+        // q1/q2/q3 can be missing, e.g. https://www.metaculus.com/api2/questions/1633/
+        optionalProperties: {
           q1: {
             type: "float64",
           },

src/backend/platforms/metaculus/index.ts

@@ -38,19 +38,21 @@ async function apiQuestionToFetchedQuestions(
     const isBinary = q.possibilities.type === "binary";
     let options: FetchedQuestion["options"] = [];
     if (isBinary) {
-      const probability = Number(q.community_prediction.full.q2);
-      options = [
-        {
-          name: "Yes",
-          probability: probability,
-          type: "PROBABILITY",
-        },
-        {
-          name: "No",
-          probability: 1 - probability,
-          type: "PROBABILITY",
-        },
-      ];
+      const probability = q.community_prediction.full.q2;
+      if (probability !== undefined) {
+        options = [
+          {
+            name: "Yes",
+            probability: probability,
+            type: "PROBABILITY",
+          },
+          {
+            name: "No",
+            probability: 1 - probability,
+            type: "PROBABILITY",
+          },
+        ];
+      }
     }
     return {
       id: `${platformName}-${q.id}`,