Log spam by KNX covers that don't have a state address (because they are groups)

Hi,

in my KNX setup I have created some group addresses that control more than one cover, like group addresses to control the covers for each floor at once and the entire house. Since those groups control more than one cover, they don’t have a particular state, which is why I have not added “position_state_address” and “angle_state_address” to the configuration of the covers in HA. However, the KNX cover component still tries to fetch their state by trying to read a value from “position_address” and “angle_address”. Since those don’t return a value/are not readable, my HA log is getting spammed by related error messages like:

2018-09-12 10:12:19 WARNING (MainThread) [xknx.log] Could not read value of <Cover name="All" updown"GroupAddress("2/0/15")/None/None/None" step="GroupAddress("2/0/16")/None/None/None" position="GroupAddress("2/0/17")/None/None/None" angle="GroupAddress("2/0/18")/None/None/None" travel_time_down="25" travel_time_up="25" /> 2/0/17
2018-09-12 10:12:20 WARNING (MainThread) [xknx.log] Could not read value of <Cover name="All" updown"GroupAddress("2/0/15")/None/None/None" step="GroupAddress("2/0/16")/None/None/None" position="GroupAddress("2/0/17")/None/None/None" angle="GroupAddress("2/0/18")/None/None/None" travel_time_down="25" travel_time_up="25" /> 2/0/18

Is there any way to tell HomeAssistant to ignore the state for those covers and always assume they are at 50% so that you can always send open/close signals? Or at least being able to somehow get rid of the log spam?
But ignoring the state would be better, since I also have issues with calling these groups from within automations. HA tracks the internal state f.e. of the “entire home” KNX group which I close at down, but only automatically open selected covers on sunrise. Thus HA keeps the state “closed” and the automation to close covers at dawn fails the next day.