make api.getTransaction return NotFound error in case of transaction not found instead of core.RippleError
make api.getTransaction return NotFound error in case of transaction not found
instead of core.RippleError

ripple/ripple-lib,wilsonianb/ripple-lib,darkdarkdragon/ripple-lib,ripple/ripple-lib,darkdarkdragon/ripple-lib,darkdarkdragon/ripple-lib,ripple/ripple-lib,ripple/ripple-lib,wilsonianb/ripple-lib,wilsonianb/ripple-lib