Tests for obligatory properties

Summary

Tests for caosdb-server!18 (merged)

Bug report in caosdb-server#146 (closed)

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CHANGELOG.md

@@ -27,6 +27,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Tests for `BEFORE`, `AFTER`, `UNTIL`, `SINCE` keywords for query
   transaction filters
   [caosdb-server#132](https://gitlab.indiscale.com/caosdb/src/caosdb-server/-/issues/132)
+* Tests for missing obligatory Properties
+  [caosdb-server#146](https://gitlab.indiscale.com/caosdb/src/caosdb-server/-/issues/146)
+
 
 ### Changed (for changes in existing functionality)