lm0 harden resolve_config_array callers against set -e

The shared resolve_config_array helper returns non-zero when the source
config var was never declared. Both callers (resolve_tar_opts,
resolve_sync_destinations) invoked it unconditionally and ignored the
return value, so under set -euo pipefail a genuinely-unset TAR_OPTS or
SYNC_DESTINATIONS would abort the function before the empty-array
fallback could run. Currently masked because apply_config_defaults
always declares both vars, but the contract was unsafe to rely on.

Guard both call sites with `|| true` and document why: the empty array
the helper leaves behind is exactly what each caller's fallback expects.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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