Merge pull request #516 from darshannnn/master

Fixing error:

Author: sheenaajay

templates/etc/systemd/system/docker-run.erb

@@ -1,11 +1,11 @@
 <%-
 	depend_services = @depend_services_array.map{|s| s =~ /\.[a-z]+$/ ? s : "#{s}.service"}
-	@after = [@service_name+".service"] +
+	@after = [@service_name.nil? ? "" : "#@service_name.service"] +
 		@sanitised_after_array.map{ |s| "#{@service_prefix}#{s}.service"} +
 		@sanitised_depends_array.map{ |s| "#{@service_prefix}#{s}.service"} +
 		depend_services
 	@wants = @sanitised_after_array.map{ |a| "#{@service_prefix}#{a}.service"}
-	@requires = [@service_name+".service"] +
+	@requires = [@service_name.nil? ? "" : "#@service_name.service"] +
 		@sanitised_depends_array.map{ |d| "#{@service_prefix}#{d}.service"} +
 		depend_services
 -%>