Traceback in Plone 4.3

Not sure if this is specific to using `collective.easyslideshow`, or a change in property API in Plone 4.3:

```
Traceback (innermost last):
Module ZPublisher.Publish, line 138, in publish
Module ZPublisher.mapply, line 77, in mapply
Module Products.PDBDebugMode.runcall, line 70, in pdb_runcall
Module ZPublisher.Publish, line 48, in call_object
Module Shared.DC.Scripts.Bindings, line 322, in __call__
Module Shared.DC.Scripts.Bindings, line 359, in _bindAndExec
Module Products.CMFCore.FSPageTemplate, line 237, in _exec
Module Products.CMFCore.FSPageTemplate, line 177, in pt_render
Module Products.PTProfiler.ProfilerPatch, line 83, in __patched_render__
Module Products.PageTemplates.PageTemplate, line 79, in pt_render
Module zope.pagetemplate.pagetemplate, line 132, in pt_render
Module zope.pagetemplate.pagetemplate, line 240, in __call__
Module zope.tal.talinterpreter, line 271, in __call__
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 888, in do_useMacro
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 533, in do_optTag_tal
Module zope.tal.talinterpreter, line 518, in do_optTag
Module zope.tal.talinterpreter, line 513, in no_tag
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 954, in do_defineSlot
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 533, in do_optTag_tal
Module zope.tal.talinterpreter, line 518, in do_optTag
Module zope.tal.talinterpreter, line 513, in no_tag
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 858, in do_defineMacro
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 954, in do_defineSlot
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 533, in do_optTag_tal
Module zope.tal.talinterpreter, line 518, in do_optTag
Module zope.tal.talinterpreter, line 513, in no_tag
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 946, in do_defineSlot
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 533, in do_optTag_tal
Module zope.tal.talinterpreter, line 518, in do_optTag
Module zope.tal.talinterpreter, line 513, in no_tag
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 858, in do_defineMacro
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 533, in do_optTag_tal
Module zope.tal.talinterpreter, line 518, in do_optTag
Module zope.tal.talinterpreter, line 513, in no_tag
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 888, in do_useMacro
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 583, in do_setLocal_tal
Module zope.tales.tales, line 696, in evaluate
- URL: file:/Users/davidb/sixfeetup/projects/foo/foo/theme/skins/foo_theme_custom_templates/slideshow_macros.pt
- Line 5, Column 0
- Expression:
- Names:
{'container': ,
'context': ,
'default': ,
'here': ,
'loop': {},
'nothing': None,
'options': {'args': ()},
'repeat': ,
'request': ,
'root': ,
'template': ,
'traverse_subpath': [],
'user': }
Module Products.PTProfiler.ProfilerPatch, line 32, in __patched_call__
Module zope.tales.expressions, line 217, in __call__
Module Products.PageTemplates.Expressions, line 155, in _eval
Module Products.PageTemplates.Expressions, line 117, in render
Module collective.easyslideshow.browser.slideshowview, line 113, in getSlideshowAllProperties
Module collective.easyslideshow.browser.slideshowview, line 100, in getSlideshowGeneralProperties
Module collective.proxyproperties.utility, line 111, in __getattribute__
AttributeError: 'FakePropertySheet' object has no attribute 'propertyIds'
> /Users/davidb/sixfeetup/projects/foo.plone4/eggs/collective.proxyproperties-0.4dev-py2.7.egg/collective/proxyproperties/utility.py(111)__getattribute__()
-> return super(FakePropertySheet, self).__getattribute__(name)

```