improve error reporting in GET_HISTORY

lib/hk-util.js

@@ -622,7 +622,8 @@ const handleGetHistory = function (Env, Server, seq, userId, parsed) {
         }, (err) => {
             if (err && err.code !== 'ENOENT') {
                 if (err.message !== 'EINVAL') { Log.error("HK_GET_HISTORY", {
-                    err: err && err.message,
+                    channel: channelName,
+                    err: err && err.message || err,
                     stack: err && err.stack,
                 }); }
                 const parsedMsg = {error:err.message, channel: channelName, txid: txid};