After the latest update of flymake I started experiencing an issue 
with indicators. The problem occurs if I try to disable indicators 
completely.

Steps to reproduce from "emacs -q":
1. Evaluate the following forms:

(setopt flymake-fringe-indicator-position nil 
        flymake-margin-indicator-position nil) 
(flymake-mode)

2. Type some invalid expression to trigger flymake.

Expected result: No indicators.

Actual result: Exclamation mark is shown right before the faulty 
expression (not even on fringe or margin).