Add test for entity.role after retrieve

Tests for caosdb-pylib!15 (merged)

tests/test_misc.py

@@ -582,6 +582,7 @@ def test_cache_performance():
         print("Time [s]: " + str(t2))
         n += 10
 
+
 def test_role_after_retrieve():
     rt = db.RecordType("TestRT").insert()
     entity = db.Entity(id=rt.id)