Openquake fails to install on worker node

[Muharem Hrnjadovic]

The openquake package fails to install on a compute cluster worker node like gemsun03:

gemsun03 ~ $ sudo apt-get install --no-install-recommends python-oq
Reading package lists... Done
Building dependency tree
Reading state information... Done
python-oq is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 6 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue [Y/n]?
Setting up python-oq (0.4.3-11) ...
/var/lib/dpkg/info/python-oq.postinst: 23: rabbitmqctl: not found
/var/lib/dpkg/info/python-oq.postinst: 27: rabbitmqctl: not found
dpkg: error processing python-oq (--configure):
 subprocess installed post-installation script returned error exit status 127
Errors were encountered while processing:
 python-oq
E: Sub-process /usr/bin/dpkg returned an error code (1)

We need to roll a new package that detects the absence of the rabbitmq and postgres services and refrains from the corresponding initialization actions.