did some code-cleanups in class_session
did some code-cleanups in class_session

kajona/kajonacms,jinshana/kajonacms,jinshana/kajonacms,kajona/kajonacms,artemeon/core,jinshana/kajonacms,jinshana/kajonacms,kajona/kajonacms,artemeon/core,artemeon/core,jinshana/kajonacms,kajona/kajonacms,jinshana/kajonacms,artemeon/core,artemeon/core