Interactive session does not accept empty input

Input >
Syntax error: None:1:1 --> * <--
Expected '%' or '\s*(\b(print|vary|view|use)\b)|(.*?)(=|#|to|\"{3})' or '[^%]+'

The expected behavior is to return and perform no operations.

Additionally, in case of error no Output cell should be displayed:

Input > f
Unknown object: None:2:7
Unknown object "f" of class "OBJECT"
Output > None