tree/branch: poky/master
commit: df8f55a919b3cc602ce1f1c51630c7edf6e36b55

In the testing for 1.3 M1, I find that Hob may report no attribute '__dummy_image__' for RecipeListModel. To trigger the issue, I followed the steps below on my Fedora 16 system:

1. Launch Hob
2. Select qemux86 and core-image-basic
3. Add some recipes, for example, x11perf, in recipe view
4. Build packages
5. exit Hob and re-launch Hob
6. Select qemux86 and core-image-basic
7. Click "View Packages"\
8. Select x11perf in "All packages"

The error message as below:
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[build@jiajun-desktop hob]$ hob
Traceback (most recent call last):
  File "/distro/m1-full/bitbake/lib/bb/ui/crumbs/packageselectionpage.py", line 218, in toggle_item_idle_cb
    self.builder.configuration.selected_image = self.recipe_model.__dummy_image__
AttributeError: 'RecipeListModel' object has no attribute '__dummy_image__'
########