package: install "nginx" package when OS isn't recognized

This will provide broader OS compatibility without having to manually add
support for specific OSes.

manifests/package.pp

@@ -90,10 +90,8 @@ class nginx::package(
       }
     }
     default: {
-      case $::operatingsystem {
+      package { 'nginx':
-        default: {
+        ensure => $package_ensure,
-          fail("Module ${module_name} is not supported on ${::operatingsystem}")
-        }
       }
     }
   }

spec/classes/package_spec.rb

@@ -111,6 +111,6 @@ describe 'nginx::package' do
 
   context 'other' do
     let(:facts) {{ :operatingsystem => 'xxx', :osfamily => 'linux' }}
-    it { expect { subject }.to raise_error(Puppet::Error, /Module nginx is not supported on xxx/) }
+    it { is_expected.to contain_package('nginx') }
   end
 end