Add exception for no daemon connection

monero/backends/jsonrpc.py

@@ -315,5 +315,6 @@ _err2exc = {
     -17: exceptions.NotEnoughMoney,
     -20: exceptions.AmountIsZero,
     -37: exceptions.NotEnoughUnlockedMoney, # PR pending: https://github.com/monero-project/monero/pull/3197
+    -38: exceptions.NoDaemonConnection, # PR 3197
     -32601: MethodNotFound,
 }

monero/exceptions.py

@@ -4,6 +4,9 @@ class MoneroException(Exception):
 class BackendException(MoneroException):
     pass
 
+class NoDaemonConnection(BackendException):
+    pass
+
 class AccountException(MoneroException):
     pass