Make facts fail gracefully if radiusd is not installed

lib/facter/freeradius_maj_version.rb

 # Grab the FreeRADIUS version from the output of radiusd -v
 Facter.add(:freeradius_maj_version) do
   setcode do
-    Facter::Core::Execution.exec('radiusd -v').split(/\n/)[0].match(/FreeRADIUS Version (\d)\.\d\.\d/)[1]
+    version = Facter::Core::Execution.exec('radiusd -v')
+    if !version.nil?
+      version = version.split(/\n/)[0].match(/FreeRADIUS Version (\d)\.\d\.\d/)[1].to_s
+    end
+    version
   end
 end

lib/facter/freeradius_version.rb

 # Grab the FreeRADIUS version from the output of radiusd -v
 Facter.add(:freeradius_version) do
   setcode do
-    Facter::Core::Execution.exec('radiusd -v').split(/\n/)[0].match(/FreeRADIUS Version (\d\.\d\.\d)/)[1]
+    version = Facter::Core::Execution.exec('radiusd -v')
+    if !version.nil?
+      version = version.split(/\n/)[0].match(/FreeRADIUS Version (\d\.\d\.\d)/)[1].to_s
     end
+    version
   end
+end
+