LU-16281 clio: append to non-existent component

LU-16281 clio: append to non-existent component

should return an error, but it fails now with a BUG below
because @rc of lov_io_layout_at() is not checked for < 0

BUG: unable to handle kernel paging request at ffff99d3c2f74030
    Call Trace:
      lov_stripe_number+0x19/0x40 [lov]
      lov_page_init_composite+0x103/0x5f0 [lov]
      ? kmem_cache_alloc+0x12e/0x270
      cl_page_alloc+0x19f/0x660 [obdclass]
      cl_page_find+0x1a0/0x250 [obdclass]
      ll_write_begin+0x1f7/0xfb0 [lustre]

HPE-bug-id: LUS-11075
Signed-off-by: Vitaly Fertman <vitaly.fertman@hpe.com>
Change-Id: I4371f56cd9cdb3429d52a283831fb0a768e5c9c3
Reviewed-on: https://es-gerrit.dev.cray.com/161123
Tested-by: Jenkins Build User <nssreleng@cray.com>
Reviewed-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/48994
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alexander <alexander.boyko@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>