Make cert_key_file and cert_chain_file optional in apache recipe

metadata.rb

@@ -3,7 +3,7 @@ maintainer       'HPC'
 maintainer_email 'hpc@gsi.de'
 license          'All rights reserved'
 description      'Installs/Configures Foswiki'
-version          '2.2.2'
+version          '2.2.3'
 depends          'apache2', '< 6.0'
 supports         'debian'
 supports         'ubuntu'

templates/web_app.conf.erb

@@ -27,8 +27,12 @@
 <% if @params[:use_tls] -%>
     SSLEngine On
     SSLCertificateFile <%= @params[:cert_file] %>
+  <% if @params[:cert_key_file] -%>
     SSLCertificateKeyFile <%= @params[:cert_key_file] %>
+  <% end -%>
+  <% if @params[:cert_chain_file] -%>
     SSLCertificateChainFile <%= @params[:cert_chain_file] %>
+  <% end -%>
 
 <% end -%>
     #   Performance hack to prevent issues with old IE browsers.