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

jedi/evaluate/compiled/access.py

@@ -340,12 +340,16 @@ class DirectObjectAccess(object):
     def getattr_paths(self, name, default=_sentinel):
         try:
             return_obj = getattr(self._obj, name)
-        except AttributeError:
-            # Happens e.g. in properties of
-            # PyQt4.QtGui.QStyleOptionComboBox.currentText
-            # -> just set it to None
+        except Exception as e:
             if default is _sentinel:
-                raise
+                if isinstance(e, AttributeError):
+                    # Happens e.g. in properties of
+                    # PyQt4.QtGui.QStyleOptionComboBox.currentText
+                    # -> just set it to None
+                    raise
+                # Just in case anything happens, return an AttributeError. It
+                # should not crash.
+                raise AttributeError
             return_obj = default
         access = self._create_access(return_obj)
         if inspect.ismodule(return_obj):

jedi/evaluate/compiled/context.py

@@ -399,7 +399,7 @@ class CompiledObjectFilter(AbstractFilter):
         # Always use unicode objects in Python 2 from here.
         name = force_unicode(name)
 
-        if is_descriptor or not has_attribute:
+        if (is_descriptor and not self._evaluator.allow_descriptor_getattr) or not has_attribute:
             return [self._get_cached_name(name, is_empty=True)]
 
         if self.is_instance and name not in dir_callback():