Update protocol

jsonrpc/__init__.py

@@ -103,15 +103,24 @@ class JSONRPC:
             return None
         method = self.methods[name]
         sig = signature(method.function)
-        params = None
-        for key in sig.parameters:
-            params[key] = ''
-        result = {
-            "jsonrpc": "2.0",
-            "method": name,
-            "params": params,
-            "id": 1
-        }
+
+        if len(sig.parameters) == 0:
+            result = {
+                "jsonrpc": "2.0",
+                "method": name,
+                "id": 1
+            }
+        else:
+            params = {}
+            for key in sig.parameters:
+                params[key] = ''
+            result = {
+                "jsonrpc": "2.0",
+                "method": name,
+                "params": params,
+                "id": 1
+            }
+
         return result
 
     def validate(self, query):