[COMMON] Readiness check has an improper image

when repository is not globally set, readinessCheck gives back "empty"
value for repository, leading to a bad rendered chart.

Issue-ID: OOM-2592
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
Change-Id: Ic4e8553ca4dfed8e476ecb743d4434e0562ba295
1 file changed