debug: toString of OutputNameValueElement do not take name into account if it is not defined

fixes #27523

src/vs/workbench/parts/debug/common/debugModel.ts

@@ -96,7 +96,7 @@ export class OutputNameValueElement extends AbstractOutputElement implements IEx
 	}
 
 	public toString(): string {
-		return `${this.name}: ${this.value}`;
+		return this.name ? `${this.name}: ${this.value}` : this.value;
 	}
 }