 "[d]efective allegations of jurisdiction may be amended, upon terms, in the trial or appellate courts." 00 U.S.C. § 0000. Although the defect in [plaintiff's] allegations must be cured by supplemental pleading, instead of amended pleading, the statutory purpose of avoiding needless sacrifice to defective pleading applies equally to this case.... Despite [plaintiff's] failure to supplement the complaint, the District Court was aware that he had filed his application; since the Secretary stipulated that the application had been filed, the defect in the pleadings surely did not prejudice him. 