Wrong wrap of raise expressions when line is too long

[patrick91]

this:

raise NotImplementedError(
    'The SimpleListFilter.lookups() method must be overridden to '
    'return a list of tuples (value, verbose value).'
)

gets converted to

raise 
NotImplementedError('The SimpleListFilter.lookups() method must be overridden to '
    'return a list of tuples (value, verbose value).'
)