Allow partial market rates in CSV export

tests/market-api-client.test.ts

@@ -33,12 +33,10 @@ describe("market-api-client", () => {
     });
   });
 
-  test("returns a missing-rate failure when the payload omits a required field", () => {
+  test("returns a missing-rate failure when the payload omits both rate fields", () => {
     expect(
       mapAuthorAseInfoResponse({
-        data: {
-          avg_search_after_view_rate: "<0.02%"
-        }
+        data: {}
       })
     ).toMatchObject({
       success: false,
@@ -46,6 +44,21 @@ describe("market-api-client", () => {
     });
   });
 
+  test("maps a partially populated payload into partial rates", () => {
+    expect(
+      mapAuthorAseInfoResponse({
+        data: {
+          personal_avg_search_after_view_rate: "0.02 - 0.1%"
+        }
+      })
+    ).toMatchObject({
+      success: true,
+      rates: {
+        personalVideoAfterSearchRate: "0.02% - 0.1%"
+      }
+    });
+  });
+
   test("returns a request-failed result for non-ok responses", async () => {
     const client = createMarketApiClient({
       fetchImpl: async () => ({