Sample config: Small fixes

sample.conf

@@ -245,6 +245,7 @@ show_old = 10
 max_old = 30
 no_data_handler = [constant]
         text = No data
+parser = text
 # See pipe module
 
 program = python3
@@ -293,8 +294,8 @@ timeout = 10
 # Options for all modules
 # =======================
 
-[constant]
-text = Hi
+[test]
+_type=constant
 # Begin of some module for showing options
 
 _color = blue