Distributions like poky-tiny have files (init) on the top level of the target directory structure.  In this case, the construction of the parent directory results in '' which later throws an exception.
Sample Exception:
ERROR: Target_File matching query does not exist.
Traceback (most recent call last):
  File "/big/src/myBugs/poky/bitbake/lib/bb/ui/toasterui.py", line 410, in main
    buildinfohelper.store_target_package_data(event)
  File "/big/src/myBugs/poky/bitbake/lib/bb/ui/buildinfohelper.py", line 1247, in store_target_package_data
    self.orm_wrapper.save_target_file_information(self.internal_state['build'], target, filedata)
  File "/big/src/myBugs/poky/bitbake/lib/bb/ui/buildinfohelper.py", line 528, in save_target_file_information
    parent_obj = self._cached_get(Target_File, target = target_obj, path = parent_path, inodetype = Target_File.ITYPE_DIRECTORY)
  File "/big/src/myBugs/poky/bitbake/lib/bb/ui/buildinfohelper.py", line 120, in _cached_get
    vars(self)[dictname][key] = clazz.objects.get(**kwargs)
  File "/big/src/myBugs/RUN/t-Django-1.8/local/lib/python2.7/site-packages/django/db/models/manager.py", line 127, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/big/src/myBugs/RUN/t-Django-1.8/local/lib/python2.7/site-packages/django/db/models/query.py", line 334, in get
    self.model._meta.object_name
DoesNotExist: Target_File matching query does not exist.