Dictionary changed size during Iteration

[coreduo0099]

Describe the bug
Organizing new files frequently causes a crash with the following output...

To Reproduce
Steps to reproduce the behaviour:
I don't have a way to produce it every time, but it happens frequently when adding a measurable number of new files and then organizing via NUT

Expected behaviour
Not to crash on file scan

NUT version (or git hash):

• Nut:3.3
• Windows 10

[privateemu]

I still get this error, I note it seems to be related to stale entries in my list of files that if I purge and rescan files it works.

From the error, it's clearly related to the dict in here:

def getFiles(self, ext=None):
	if len(fileLUT) == 0:
		for path, f in Nsps.files.items():
			tid = f.titleId.upper()
			if tid not in fileLUT:
				fileLUT[tid] = []
			fileLUT[tid].append(f)

	if self.id in fileLUT:
		return self.filterExt(fileLUT[self.id], ext)

	return []

Changing, so the nsps.files.items() can't find that's expected. I might try to debug more, but it would be useful it also when one hit "scan" it would purge deleted records.