Refactoring the code to make consitional return explicit

Author: rafaelfranca

actionview/lib/action_view/view_paths.rb

@@ -16,10 +16,14 @@ module ViewPaths
     module ClassMethods
       def _prefixes # :nodoc:
         @_prefixes ||= begin
-          deprecated_prefixes = handle_deprecated_parent_prefixes and return deprecated_prefixes
-
-          return local_prefixes if superclass.abstract?
-          local_prefixes + superclass._prefixes
+          deprecated_prefixes = handle_deprecated_parent_prefixes
+          return deprecated_prefixes if deprecated_prefixes
+
+          if superclass.abstract?
+            local_prefixes
+          else
+            local_prefixes + superclass._prefixes
+          end
         end
       end
 
@@ -33,6 +37,7 @@ def local_prefixes
 
       def handle_deprecated_parent_prefixes # TODO: remove in 4.3/5.0.
         return unless respond_to?(:parent_prefixes)
+
         ActiveSupport::Deprecation.warn "Overriding ActionController::Base::parent_prefixes is deprecated, override .local_prefixes instead."
         local_prefixes + parent_prefixes
       end