Cannot use argument_for on DialectKWArgs not explicitly in construct_arguments

Using 0.9.4

from sqlalchemy.sql.expression import Insert
Insert.argument_for('mysql', 'foo', False)

returns

Traceback (most recent call last):
  File "test.py", line 2, in <module>
    Insert.argument_for('mysql', 'foo', False)
  File "/usr/local/lib/python2.7/site-packages/sqlalchemy/sql/base.py", line 184, in argument_for
    construct_arg_dictionary[cls][argument_name] = default
KeyError: <class 'sqlalchemy.sql.dml.Insert'>

Because mysql doesn't have Insert explicitly in it's construct_arguments we get the KeyError.

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