Update undefinedText property.

index.html

@@ -83,6 +83,7 @@
           data: [
             {name: 'height', type: 'Number', description: 'The height of table.', 'default': 'undefined'},
             {name: 'sortName', type: 'String', description: 'Defines which column can be sorted.', 'default': 'undefined'},
+            {name: 'undefinedText', type: 'String', description: 'Defines the default undefined text.', 'default': undefined},
             {name: 'sortOrder', type: 'String', description: 'Defines the column sort order, can only be "asc" or "desc".', 'default': 'asc'},
             {name: 'columns', type: 'Array', description: 'The table columns config object, see column properties for more details.', 'default': '[]'},
             {name: 'data', type: 'Array', description: 'The data to be loaded.', 'default': '[]'}