simple generator static analysis subscript check

jedi/evaluate/analysis.py

@@ -8,6 +8,7 @@ from jedi import debug
 CODES = {
     'attribute-error': (1, 'Potential AttributeError.'),
     'import-error': (2, 'Potential ImportError.'),
+    'type-error-generator': (3, "TypeError: 'generator' object is not subscriptable."),
 }