rule out empty string for symbol (#10712)

ui/app/pages/confirm-approve/confirm-approve.js

@@ -88,7 +88,9 @@ export default function ConfirmApprove() {
     ? getCustomTxParamsData(data, { customPermissionAmount, decimals })
     : null;
 
-  return tokenSymbol ? (
+  return tokenSymbol === undefined ? (
+    <Loading />
+  ) : (
     <ConfirmTransactionBase
       toAddress={toAddress}
       identiconAddress={tokenAddress}
@@ -142,7 +144,5 @@ export default function ConfirmApprove() {
       hideSenderToRecipient
       customTxParamsData={customData}
     />
-  ) : (
-    <Loading />
   );
 }