Fix south migration problem caused by 0003_update_keys_to_textversion using TextVersion model which is updated only in 0010_auto__add_field_textversion_category_1__add_field_textversion_category, same with 0007_populate_id_key_in_comments using Comment model updated in 0011_auto__add_field_comment_category.

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class AbiConverterError(Exception):

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    pass

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class AbiCommandError(Exception):

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    pass

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class ToolsConverterError(Exception):

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    pass