Except for sources required to have a permit before construction or modification under the applicable requirements of this subchapter, if an applicant has submitted a timely and complete application for a permit required by this title (including renewals), but final action has not been taken on such application, the source's failure to have a permit shall not be a violation of this subchapter, unless the delay in final action was due to the failure of the applicant to timely submit information required or requested to process the application.