wr0ngway/rubber — pull request #124 by akremer (2012-02-07 14:35:49+00:00)
Title: Dont output empty environment variables into munin plugin conf

When munin encounters an empty environment variable in it's plugin conf, it barfs and stops processing the file.

Example:

```
env.rvm_project_rvmrc 0
env.rvm_tmp_path /usr/local/rvm/tmp
env.GEM_PATH
env.rvm_lib_path /usr/local/rvm/lib
```

Result:
Line is not well formed (env.GEM_PATH) at /usr/share/perl5/Munin/Node/Service.pm line 81
at /etc/munin/plugin-conf.d/rubber line 41. Skipping the rest of the file at /usr/share/perl5/Munin/Node/Service.pm line 81