"Children models" block empty when model has exposures

### Expected behavior

When a model is opened in VS Code and this model is linked to the exposures, the block "Children Models" shows a list of models (possibly also exposures?)

### Actual behavior

When a model is opened in VS Code and it is linked to the exposure, the block "Children Models" is empty and an error "Cannot read properties of undefined (reading '0')"

### Steps To Reproduce

1. Open dbt repository in VS Code
2. Open model that has exposures in a new tab
3. Open the extension "dbt Power User" in the sidebar
4. extend the tab "children models", if it is hidden

### Log output/Screenshots




### Operating System

Mac OS

### dbt version

1.7.4

### dbt Adapter

bigquery

### dbt Power User version

0.28.4

### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!