S. 11: Property held for charitable purposes-Revised return-Break-up of foreign contribution as ‘corpus fund donation’ or ‘other than corpus fund donation’-Failure to upload revised return-Revised return which assessee could not file due to technical glitches was to be considered by Assessing Officer subject to verification of donations and to allow claim for exemption under section 11 to assessee-trust [S. 12, 139(5), 143(1), 154]