If we always choose `0` as the default value for `endVal` in case it is
not given (maybe apollo assigns null when the request is in flight) then
just make `0` the default.
This commit message is a great example of why you should explain
**the reason** of your commit.
When I came across this bug I had a quick look into the code where it
came from. I could see that the bug only happened after a timer and
apparently reverting the biggest part of d84892930295dcfd3f6687fc33c7234446127099
would fix the bug. However I have no idea what the following commit
message means:
```
commit d84892930295dcfd3f6687fc33c7234446127099
Author: Grzegorz Leoniec <greg@app-interactive.de>
Date: Wed Mar 6 18:45:57 2019 +0100
Improved countTo component
```
I just don't know why the code is there - like what is it's purpose
@appinteractive? I can only guess: I believe that it's supposed to
update the counters in-place (without starting from 0 everytime).
Because apollo was set to poll the data every second.
Taking that into account I would rather remove this polling feature
completely and have less code and less complexity. Admins can still
refresh the page.
