fix issue with params.pp with strict_variables enabled #35
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When strict_variables are enabled Puppet runs fail with Evaluation Error: Unknown variable: '::redis::params::ppa_repo'.
This happens when the osfamily fact is set to anything but Debian because the ppa_repo variable is not defined and is referenced in init.pp parameters.
Defining the variable under the other osfamilys and setting it to undef fixes the issue.
https://docs.puppetlabs.com/references/latest/configuration.html#strictvariables