[BUGFIX] return from listchoice() without response (+pep8)

"response" is not a valid variable. Because we always
leave the infinite loop explicit on previous parts,
we do not need any return on the end of the function.

Change-Id: I8d50ccd40ccceb030e6b874bc84289273f567683
Merge "[BUGFIX] return from listchoice() without response (+pep8)"