cache and low_level_cache should always return nil

Author: joeldrapper

lib/phlex/sgml.rb

@@ -298,6 +298,8 @@ def cache(*cache_key, **, &content)
 		].freeze
 
 		low_level_cache(full_key, **, &content)
+
+		nil
 	end
 
 	# Cache a block of content where you control the entire cache key.
@@ -331,6 +333,8 @@ def low_level_cache(cache_key, **options, &content)
 				end
 			end
 		end
+
+		nil
 	end
 
 	def json_escape(string)