fix loadBalancer error not catched

[sebglon]

What type of PR is this?

/kind bug Fixes a loadBalancer reconcile error not catched.

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #

Special notes for your reviewer:

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

TODOs:

• [x] squashed commits
• [x] includes documentation
• [x] adds unit tests

[sebglon]

@outscale-hmi can you review please?