Merged PR 1682: Set default expirationDate if empty provided

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 "".
Fix absence of https://dev.azure.com/slb-swt/data-at-rest/_git/dps-legal?path=%2Flegal%2Fsrc%2Fmain%2Fjava%2Fcom%2Fslb%2Flegal%2Futil%2FTimestampAdapter.java

Related work items: #2105
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