New semantic analyzer: Namespace package with __init__.py breaks analysis

I'm getting a lot of errors reported that are not errors.

• Classes are reported as invalid types
• Calls to methods are reported as modules not having those attributes
• Instances of classes are reported as modules not callable
• Types passed to, e.g., isinstance are reported as incompatible type Module (suggests that all custom types are treated as type Module)
• Base classes are reported as invalid base classes
• Calls to instances of classes are reported as not having the specified attributes
• Package imports in __init__.py are reported as already defined

I am not sure whether these are issues are caused by the new semantic analyzer or by the Mypy plugin for PyCharm which has not been updated yet.

In comparison, with the new semantic analyzer disabled, there are no errors. The application works correctly.

El issue no nombra archivos ni tests. Empieza reproduciendo los falsos positivos reportados con un paquete de espacio de nombres que contenga init.py, comparando el nuevo analizador semántico con el analizador deshabilitado y teniendo en cuenta la distinción del plugin de PyCharm. Se considera terminado cuando los errores enumerados de clase, método, instancia, herencia e importación de paquetes ya no se reporten para la reproducción.