(bug): Handle controller reconcileFailed error condition when running PV discovery

[ibolton336]

Currently when a reconcileFailed condition arises, the pv discovery process will hang because no observedDigest field is added to the status object. After discussing with Jeff, a solution would be to ensure status of the migPlan has been reconciled at least once. The CR won't have the observedDigest field in the status unless it has been reconciled at least once. He recommend we treat the field as = "" when not there.