Only load scan results if a scan ran

`getLatestOnerepScan` either returns `null` or a scan, so a check
for !== "undefined" will always be true.

In practice, that should have the same results, since fetching
scan results should still return an empty array, but not running
the query in the first place is more efficient.

src/db/tables/onerep_scans.ts

@@ -150,7 +150,7 @@ async function getLatestOnerepScanResults(
 
   let results: OnerepScanResultRow[] = [];
 
-  if (typeof scan !== "undefined") {
+  if (scan !== null) {
     const qaToggles = await getQaToggleRow(onerepProfileId);
     let showCustomBrokers = false;
     let showRealBrokers = true;