Add check to ensure regex does not throw for none type.

Add a quick check to ensure puppetversion value is not nil and supporting test.

lib/facter/pe_version.rb

@@ -10,8 +10,13 @@
 #
 Facter.add("pe_version") do
   setcode do
-    pe_ver = Facter.value("puppetversion").match(/Puppet Enterprise (\d+\.\d+\.\d+)/)
-    pe_ver[1] if pe_ver
+    puppet_ver = Facter.value("puppetversion")
+    if puppet_ver != nil
+      pe_ver = puppet_ver.match(/Puppet Enterprise (\d+\.\d+\.\d+)/)
+      pe_ver[1] if pe_ver
+    else
+      nil
+    end
   end
 end
 

spec/unit/facter/pe_version_spec.rb

@@ -14,6 +14,17 @@ describe "PE Version specs" do
       Facter.collection.loader.load(:pe_version)
     end
   end
+  
+  context "When puppetversion is nil" do
+    before :each do
+      Facter.fact(:puppetversion).stubs(:value).returns(nil)
+    end
+    
+    it "pe_version is nil" do
+      expect(Facter.fact(:puppetversion).value).to be_nil
+      expect(Facter.fact(:pe_version).value).to be_nil
+    end
+  end
 
   context "If PE is installed" do
     %w{ 2.6.1 2.10.300 }.each do |version|
@@ -73,4 +84,5 @@ describe "PE Version specs" do
       expect(Facter.fact(:pe_patch_version).value).to be_nil
     end
   end
+
 end