[collectd] Notifications in 4.6.2 and 4.7

[Andrés J. Díaz]

Hi Florian (et al)

> it's a bug. I've applied your patch in the meantime, it'd be
> awesome if you could give it a try and check if it works
> as expected now.

I been used this "patch" for weeks and works as expected. I test the
change in 4.6.2 and in 4.7.0 with good results :)

Regards,
  Andrés