Garbage collection failure proof

[nesitor]

Fix: Solve garbage collection deleting issues that raises individually and stops the garbage process.

Self proofreading checklist

• Is my code clear enough and well documented
• Are my files well typed
• New translations have been added or updated if new strings have been introduced in the frontend
• Database migrations file are included
• Are there enough tests
• Documentation has been included (for new feature)

Changes

• Added a try catch for every file to avoid aborting the entire garbage collection process only caused by one file error.

How to test

Execute pyaleph and check that garbage collection runs smoothly and well.

[amalcaraz]

LGTM