Fix KeyError: use .get() for all optional result fields

src/cad_documenter/cli_project.py

@@ -147,7 +147,7 @@ def process(project_path: Path, process_all: bool, export_only: bool):
                 for name in results['updated_components']:
                     console.print(f"  [yellow]~[/yellow] {name}")
         
-        if results['errors']:
+        if results.get('errors'):
             console.print("\n[bold red]Errors:[/bold red]")
             for err in results['errors']:
                 console.print(f"  [red]X[/red] {err['video']}: {err['error']}")