fix(yaml) report target as failed when the key is not found instead of a false positive

[dduportal]

Fix #379

Logic flaw in the YAML file's target. Unit test had to be updated to catch this one

Tested with the example of the associated issue:

TARGETS
========

imageTag
--------

**Dry Run enabled**

ERROR: Something went wrong in target "imageTag" :
ERROR: ✗ cannot find key 'image.tag' from file '/var/folders/2s/09szbrgn22l2tcvxz1_k34g40000gn/T/updatecli/dduportal/charts/config/wiki.yaml'


=============================

REPORTS:


✔ WIKI.YAML:
        Sources:
                ✔ [latestRelease] Get latest jenkins-infra/docker-confluence-data release(githubRelease)
        Condition:
                ✔ [docker] Test jenkinsciinfra/wiki:<latest_version> docker image tag(dockerImage)
        Target:
                ✗ [imageTag]  Update wiki docker image tag(yaml)
                ```