Removed shared_error from CMS_API

Added Missing theme and Missing tempalte classes.
Updated CMS_RESPONSE to handle missing template and send a 503 status code
with a raw response.

library/src/service/cms_api.e

@@ -8,8 +8,6 @@ class
 
 inherit
 
-	SHARED_ERROR
-
 	REFACTORING_HELPER
 
 create
@@ -23,7 +21,6 @@ feature -- Initialize
 			setup := a_setup
 			create error_handler.make
 			initialize
-			set_successful
 		ensure
 			setup_set: setup = a_setup
 			error_handler_set: not error_handler.has_error

library/src/service/filter/cms_error_filter.e

@@ -20,6 +20,7 @@ feature -- Basic operations
 	execute (req: WSF_REQUEST; res: WSF_RESPONSE)
 			-- Execute the filter
 		do
+			fixme ("Check if it's ok to add new fetures CMS_API.has_error:BOOLEAN and CMS_API.error_description.")
 			if not api.error_handler.has_error then
 				log.write_information (generator + ".execute")
 				execute_next (req, res)

library/src/service/response/cms_response.e

@@ -740,8 +740,9 @@ feature -- Theme
 			if l_info.engine.is_case_insensitive_equal_general ("smarty") then
 				create {SMARTY_CMS_THEME} theme.make (setup, l_info)
 			else
-				to_implement ("Add a default SMARTY_CMS_THEME")
-				create {SMARTY_CMS_THEME} theme.make (setup, l_info)
+				create {MISSING_CMS_THEME} theme.make (setup)
+				status_code := {HTTP_STATUS_CODE}.service_unavailable
+				to_implement ("Check how to add the Retry-after, http://tools.ietf.org/html/rfc7231#section-6.6.4 and http://tools.ietf.org/html/rfc7231#section-7.1.3")
 			end
 		end