Update jsonrpc2.js

lib/jsonrpc2.js

@@ -41,7 +41,8 @@ function JsonRpcObject() {
     }
 
     this.call = function(method, params, id) {
-        var data = HTTP.create("MSXML")
+        var result;
+        var response = HTTP.create("MSXML")
             .setContentType("application/json")
             .setDataType("json")
             .setRequestBody(encode(method, params, id))
@@ -50,7 +51,16 @@ function JsonRpcObject() {
             .responseBody
         ;
 
-        return data;
+        if ("error" in response) {
+            console.error(response.error.message);
+            return;
+        }
+
+        if ("result" in response) {
+            result = response.result;
+        }
+
+        return result;
     }    
 }