Fix a python3 issue with py__file__.

jedi/evaluate/compiled/__init__.py

@@ -85,7 +85,10 @@ class CompiledObject(Context):
         return bool(self.obj)
 
     def py__file__(self):
-        return self.obj.__file__
+        try:
+            return self.obj.__file__
+        except AttributeError:
+            return None
 
     def is_class(self):
         return inspect.isclass(self.obj)

jedi/evaluate/representation.py

@@ -26,7 +26,8 @@ py__iter__()                           Returns a generator of a set of types.
 py__class__()                          Returns the class of an instance.
 py__getitem__(index: int/str)          Returns a a set of types of the index.
                                        Can raise an IndexError/KeyError.
-py__file__()                           Only on modules.
+py__file__()                           Only on modules. Returns None if does
+                                       not exist.
 py__package__()                        Only on modules. For the import system.
 py__path__()                           Only on modules. For the import system.
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