some pictures end up without cache_id during comparison

No idea how.

Application Identifier: com.hardcoded_software.dupeguru_pe
Application Version: 1.7.3

Traceback (most recent call last):
  File "hsutil/cocoa.pyc", line 45, in _async_run
  File "dupeguru/app.pyc", line 209, in do
  File "dupeguru/scanner.pyc", line 84, in GetDupeGroups
  File "dupeguru/picture/matchbase.pyc", line 48, in getmatches
  File "dupeguru/picture/matchbase.pyc", line 117, in _do_getmatches
  File "hsfs/_fs.pyc", line 151, in __getattr__
AttributeError: Trying to get attribute cache_id with an _info at {'dimensions': (3504.0, 2332.0)} and cls_info_map at {'size': 0, 'dimensions': 2, 'md5partial': 1, 'mtime': 0, 'md5': 1, 'ctime': 0}