Fix a bug with ds3_get_bucket where it would return a DS3_ERROR_INVALID_XML error if the S3 server responded with a 404/notfound error (i.e. tried to list objects in a bucket that did not exist).
Fix a bug with ds3_get_bucket where it would return a
DS3_ERROR_INVALID_XML error if the S3 server responded with a 404/notfound
error (i.e. tried to list objects in a bucket that did not exist).

ds3.c:
	Update ds3_get_bucket to return _internal_request_dispatcher's returned
	error if it returned one.

shabtaisharon/ds3_c_sdk,TigerTechnology/ds3_c_sdk,tigertechdev/ds3_c_sdk,rpmoore/ds3_c_sdk,robertgrimm/ds3_c_sdk,TigerTechnology/ds3_c_sdk,tigertechdev/ds3_c_sdk,chanchett/ds3_c_sdk,SpectraLogic/ds3_c_sdk,rpmoore/ds3_c_sdk,robertgrimm/ds3_c_sdk,chanchett/ds3_c_sdk,DenverM80/ds3_c_sdk,TigerTechnology/ds3_c_sdk,TigerTechnology/ds3_c_sdk,robertgrimm/ds3_c_sdk,tigertechdev/ds3_c_sdk,chanchett/ds3_c_sdk,DenverM80/ds3_c_sdk,robertgrimm/ds3_c_sdk,DenverM80/ds3_c_sdk,shabtaisharon/ds3_c_sdk,SpectraLogic/ds3_c_sdk,DenverM80/ds3_c_sdk,SpectraLogic/ds3_c_sdk,shabtaisharon/ds3_c_sdk,SpectraLogic/ds3_c_sdk,rpmoore/ds3_c_sdk