Update os-core-common lib in legal service

Changes in PRs are needed in legal service: osdu/platform/system/lib/core/os-core-common!7 (merged) osdu/platform/system/lib/core/os-core-common!9 (merged)

Set default expirationDate if empty provided. When legalTag is created expiration date may be passed or not, need to handle a case, when it is "".