remove empty kwargs

src/rougail/tiramisureflector.py

@@ -168,7 +168,7 @@ class Common:
 
     def _populate_attrib(self,
                          keys: dict,
-                         ) -> None:
+                         ) -> None:  # pragma: no cover
         raise NotImplementedError()
 
     @staticmethod
@@ -277,8 +277,10 @@ class Variable(Common):
                     args.append(str(value))
                 else:
                     kwargs.append(f"'{param.name}': " + value)
-        ret = f"Calculation(func.{function}, Params((" + ', '.join(args) + \
-                "), kwargs=" + "{" + ', '.join(kwargs) + "})"
+        ret = f'Calculation(func.{function}, Params((' + ', '.join(args) + ')'
+        if kwargs:
+            ret += ', kwargs={' + ', '.join(kwargs) + '}'
+        ret += ')'
         if hasattr(child, 'warnings_only'):
             ret += f', warnings_only={child.warnings_only}'
         return ret + ')'