Filter out empty or null values in metadata for PutObjectRequest
Filter out empty or null values in metadata for PutObjectRequest

RachelTucker/ds3_net_sdk,rpmoore/ds3_net_sdk,rpmoore/ds3_net_sdk,shabtaisharon/ds3_net_sdk,RachelTucker/ds3_net_sdk,shabtaisharon/ds3_net_sdk,SpectraLogic/ds3_net_sdk,SpectraLogic/ds3_net_sdk,SpectraLogic/ds3_net_sdk,rpmoore/ds3_net_sdk,shabtaisharon/ds3_net_sdk,RachelTucker/ds3_net_sdk