Fix for –usn-policy: Fatal error => Value cannot be null. Parameter name: source #3762
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Fixes crash reported at https://forum.duplicati.com/t/usn-policy-fatal-error-value-cannot-be-null-parameter-name-source/7023.
Issue was due to empty filter expression not being handled by Utility.FilterExpression.GetFilterHash(). This PR also fixes a similar potential bug in Utility.FilterExpression.