If node is not installed and we are not ubuntu precise tell the use to do it manually
If node is not installed and we are not ubuntu precise tell the use to do it manually

Fixes: https://github.com/globaleaks/GlobaLeaks/issues/393

vodkina/GlobaLeaks,vodkina/GlobaLeaks,vodkina/GlobaLeaks,vodkina/GlobaLeaks