qvm-prefs: Don't falsely report 'no such property' #268
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Previously we printed a 'no such property' error for all exceptions that are an instance of AttributeError which includes
QubesPropertyAccessError and therefore generated confusing error messages. Print them only in case of QubesNoSuchPropertyError.
Fixes QubesOS/qubes-issues#8666
Related to QubesOS/qubes-issues#5005