cli: fix -getinfo output when compiled with no wallet

Author: fanquake

src/bitcoin-cli.cpp

@@ -265,7 +265,7 @@ class GetinfoRequestHandler: public BaseRequestHandler
         result.pushKV("proxy", batch[ID_NETWORKINFO]["result"]["networks"][0]["proxy"]);
         result.pushKV("difficulty", batch[ID_BLOCKCHAININFO]["result"]["difficulty"]);
         result.pushKV("chain", UniValue(batch[ID_BLOCKCHAININFO]["result"]["chain"]));
-        if (!batch[ID_WALLETINFO].isNull()) {
+        if (!batch[ID_WALLETINFO]["result"].isNull()) {
             result.pushKV("walletversion", batch[ID_WALLETINFO]["result"]["walletversion"]);
             result.pushKV("balance", batch[ID_WALLETINFO]["result"]["balance"]);
             result.pushKV("keypoololdest", batch[ID_WALLETINFO]["result"]["keypoololdest"]);