Return actNotFound for non-existent account in traverseOwnedNodes (#382)

src/rpc/RPCHelpers.cpp

@@ -663,6 +663,10 @@ traverseOwnedNodes(
     boost::asio::yield_context& yield,
     std::function<void(ripple::SLE&&)> atOwnedNode)
 {
+    if (!backend.fetchLedgerObject(
+            ripple::keylet::account(accountID).key, sequence, yield))
+        return Status{Error::rpcACT_NOT_FOUND};
+
     auto parsedCursor =
         parseAccountCursor(backend, sequence, jsonCursor, accountID, yield);
 

src/rpc/handlers/GatewayBalances.cpp

@@ -138,7 +138,7 @@ doGatewayBalances(Context const& context)
         return true;
     };
 
-    traverseOwnedNodes(
+    auto result = traverseOwnedNodes(
         *context.backend,
         accountID,
         lgrInfo.seq,
@@ -146,6 +146,8 @@ doGatewayBalances(Context const& context)
         {},
         context.yield,
         addToResponse);
+    if (auto status = std::get_if<RPC::Status>(&result))
+        return *status;
 
     if (!sums.empty())
     {