Clean up Platform#params.

State your normal case first, then deal with edge cases, not the other
way around.

Signed-off-by: Ryan Davis <zenspider@chef.io>

lib/inspec/resources/platform.rb

@@ -27,7 +27,7 @@ module Inspec::Resources
     end
 
     def arch
-      @platform.arch
+      @platform.arch if @platform.respond_to?(:arch)
     end
 
     def families
@@ -56,16 +56,16 @@ module Inspec::Resources
     end
 
     def params
+      # rubocop:disable Layout/AlignHash
       h = {
         name:     name,
         families: families,
         release:  release,
+        arch:     arch,
       }
+      # rubocop:enable Layout/AlignHash
 
-      # Avoid adding Arch for APIs (not applicable)
-      unless in_family?("api")
-        h[:arch] = arch
-      end
+      h.delete :arch if in_family?("api") # not applicable if api
 
       h
     end