We need an explicit return

If we don't return early Ruby will memoize the value of the prefix of
the parent class what will make the subsequent searchs to not work as
expected.

If the early return we are avoiding the memoization.

But when using the deprecated path we need to memoize the value, so we
are not using early return for the deprecated path.

actionview/lib/action_view/view_paths.rb

@@ -17,11 +17,11 @@ module ActionView
       def _prefixes # :nodoc:
         @_prefixes ||= begin
           deprecated_prefixes = handle_deprecated_parent_prefixes
-          return deprecated_prefixes if deprecated_prefixes
-
-          if superclass.abstract?
-            local_prefixes
+          if deprecated_prefixes
+            deprecated_prefixes
           else
+            return local_prefixes if superclass.abstract?
+
             local_prefixes + superclass._prefixes
           end
         end