Eliminate infinite loop when pickle loads BaseAWSObject and objects derived from it. #1016
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If pickle loads this object, then getattr will cause an infinite loop when pickle invokes this object to look for setstate before attributes is "loaded" into this object. Therefore, short circuit the rest of this call if attributes is not loaded yet. See http://grokbase.com/t/python/python-bugs-list/092sczhjwk/issue5370-unpickling-vs-getattr for source of this change.