Bug: Fix file deletion failing when parent is missing

MERGE REQUEST

Overview

This MR fixes a bug where a file couldn't be deleted if the parent doesn't exist anymore.

Example for Visual changes (ie Screenshot)

N/A

Issues Closed

N/A

Checklist

Review and complete the checklist to ensure that the MR is complete before assigned to an approver.

• [ ] All new methods, or updating methods have clear docstrings
• Testing added or updated for new methods
• [ ] Any new packages are added to Makefile and .gitlab-ci.yml
• [ ] API documentation updated for API updates
• [ ] Module README.md updated for changes to work flow
• [ ] Issue added to Sia-UI repo for new supporting features