Description
If a Meta Data Point has an empty context, it should not be recalculated during initialization for Context Update and Change.

To Reproduce

1. Login as admin;
2. Created Meta Data Soruce as meta_1(enable) and two Meta Data Points:

• dp_empty_change (settable, context: empty, enable, scirpt: "return 11;", Update event: Context change) ,
• dp_empty_update (settable, context: empty, enable, script: "return 10;" Update event: Context update);

4. Go to Watch Lists;
5. Create Watch List as wl_1 with points:

• meta_1 - dp_empty_change,
• meta_1 - dp_empty_update;

6. Set values:

• meta_1 - dp_empty_change to 123;
• meta_1 - dp_empty_update to 321;

7. Restart tomcat;
8. Login as admin;
9. Go to Watch Lists and select wl_1 then values;

• meta_1 - dp_empty_change is 11 -> error 1,
• meta_1 - dp_empty_update is 10 -> error 2;
  The script was recalculated on initialization despite an empty context.

Spec:

• Scada-LTS Version 2.7.7.3