editor: crash on change HSV input fields

[nikitinator]

Exception caught:
         rodedit_main.nim(76)     rodedit_main
        sdl_window.nim(561)      runUntilQuit
        sdl_window.nim(509)      nextEvent
        sdl_window.nim(440)      handleEvent
        app.nim(91)              handleEvent
        window_event_handling.nim(64) handleEvent
        window_event_handling.nim(70) handleEvent
        view_event_handling.nim(127) processTouchEvent
        view_event_handling.nim(127) processTouchEvent
        view_event_handling.nim(113) processTouchEvent
        view_event_handling.nim(14) onTouchEv
        text_field.nim(284)      onTouchEv
        view.nim(255)            makeFirstResponder
        view.nim(258)            makeFirstResponder
        view.nim(251)            makeFirstResponder
        view.nim(242)            viewDidBecomeFirstResponder
        text_field.nim(493)      viewDidBecomeFirstResponder
        chcks.nim(68)            startTextInput
        fatal.nim(39)            sysFatal
        Error: unhandled exception: cannot dispatch; dispatcher is nil [NilAccessError]

Traceback (most recent call last)
rodedit_main.nim(76)     rodedit_main
sdl_window.nim(561)      runUntilQuit
sdl_window.nim(509)      nextEvent
sdl_window.nim(440)      handleEvent
app.nim(91)              handleEvent
window_event_handling.nim(64) handleEvent
window_event_handling.nim(70) handleEvent
view_event_handling.nim(127) processTouchEvent
view_event_handling.nim(127) processTouchEvent
view_event_handling.nim(113) processTouchEvent
view_event_handling.nim(14) onTouchEv
text_field.nim(284)      onTouchEv
view.nim(255)            makeFirstResponder
view.nim(258)            makeFirstResponder
view.nim(251)            makeFirstResponder
view.nim(242)            viewDidBecomeFirstResponder
text_field.nim(493)      viewDidBecomeFirstResponder
chcks.nim(68)            startTextInput
SIGILL: Illegal operation.
tool_wrapper.nim(56)     wrapperAUX
Error: unhandled exception: rodedit failed [Exception]