MemoryError during add_match

[hsoft]

@@@
Application Identifier: com.hardcoded_software.dupeguru_pe
Application Version: 1.7.6

Traceback (most recent call last):
File "hsutil/cocoa.pyc", line 47, in _async_run
File "dupeguru/app.pyc", line 238, in do
File "dupeguru/scanner.pyc", line 111, in GetDupeGroups
File "dupeguru/engine.pyc", line 359, in get_groups
File "dupeguru/engine.pyc", line 255, in add_match
MemoryError
@@@

[hsoft]

This doesn't affect just PE, but all eds

[hsoft]

(from [185]) [#70 state:fixed] Wrapped get_groups() into a try..except MemoryError