Better handle groups w/o members

There was a chance that groups w/o members could end up causing a failure to
store the group. This would happen in case the structure used by glibc to fill
up the group data was "dirty". Always memset structures before passing them to
te libc and also check if there are any members, before calling the async
function.
Finally add some tracing at level 7 so that it is easier to follow what is going
on in case of touble.

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