Adding a symbol that doesn't lead to a screen throws an error in validation

I added a symbol to DCM.bob just showing a diagram, and in the validation step of techui-builder I got:
```[12/10/25 15:20:17] ERROR    Actions group not found in component: None ```
This did not affect the validation of the screen and it could be opened perfectly fine afterwards.

## Acceptance Criteria
- The actions group check is ignored for symbols that are not intending to open a screen 
