Merge pull request #4565 from inspec/zenspider/rspec_method_missing

Fix problem in method_missing in rspec extensions when backend unavailable.

lib/inspec/dsl.rb

@@ -34,6 +34,8 @@ module Inspec::DSL
   # resource.
 
   def self.method_missing_resource(backend, id, *arguments)
+    return unless backend
+
     begin
       require "inspec/resources/#{id}"
     rescue LoadError

lib/inspec/rspec_extensions.rb

@@ -50,6 +50,7 @@ module Inspec
     def method_missing(method_name, *arguments, &block)
       # see if it is a resource first
       begin
+        inspec = inspec if respond_to?(:inspec) # backend not available??
         resource = Inspec::DSL.method_missing_resource(inspec, method_name, *arguments)
         return resource if resource
       rescue LoadError