Fixed goodies: f symbol is not declared even if typing is not present.

Author: Sylvain MARIE

mini_lambda/goodies.py

@@ -21,4 +21,5 @@
     from typing import Callable
     f = InputVar('f', Callable)
 except ImportError:
-    pass
+    # no typing module but at least create something
+    f = InputVar('f')