fail gracefully for this particular error

from sqlalchemy.ext.declarative import declarative_base

from sqlalchemy import *

Base = declarative_base()
class MyClass(Base):
    __table__ = Table("x",
    Base.metadata,
    Column('id', Integer, primary_key=True),
    Column('foo', String)
    )

class MySubClass(MyClass):
    def foo(self):
        pass

stack trace, for weird python reasons ? is:

    self._configure_properties()
  File "/Users/classic/dev/sqlalchemy/lib/sqlalchemy/orm/mapper.py", line 824, in _configure_properties
    not self._should_exclude(key, key, local=False, column=None):
  File "/Users/classic/dev/sqlalchemy/lib/sqlalchemy/orm/mapper.py", line 1481, in _should_exclude
    getattr(self.class_, assigned_name)):
  File "/Users/classic/dev/sqlalchemy/lib/sqlalchemy/orm/mapper.py", line 1458, in _is_userland_descriptor
    isinstance(obj.__get__(None, obj),
TypeError: Error when calling the metaclass bases
    issubclass() arg 1 must be a class

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