Make it possible to access properties again

This time we catch all exceptions and try to avoid issues for the user.

This is only happening when working with an Interpreter. I don't feel this is
necessary otherwise.

See #1299

jedi/evaluate/__init__.py

@@ -106,6 +106,7 @@ class Evaluator(object):
         self.is_analysis = False
         self.project = project
         self.access_cache = {}
+        self.allow_descriptor_getattr = False
 
         self.reset_recursion_limitations()
         self.allow_different_encoding = True