[RPC] [wallet] allow getbalance to use min_conf and watch_only without accounts.

test/functional/wallet_basic.py

@@ -64,6 +64,15 @@ class WalletTest(BitcoinTestFramework):
         assert_equal(self.nodes[1].getbalance(), 50)
         assert_equal(self.nodes[2].getbalance(), 0)
 
+        # Check getbalance with different arguments
+        assert_equal(self.nodes[0].getbalance("*"), 50)
+        assert_equal(self.nodes[0].getbalance("*", 1), 50)
+        assert_equal(self.nodes[0].getbalance("*", 1, True), 50)
+        assert_equal(self.nodes[0].getbalance(minconf=1), 50)
+
+        # first argument of getbalance must be excluded or set to "*"
+        assert_raises_rpc_error(-32, "dummy first argument must be excluded or set to \"*\"", self.nodes[0].getbalance, "")
+
         # Check that only first and second nodes have UTXOs
         utxos = self.nodes[0].listunspent()
         assert_equal(len(utxos), 1)