TST: disable two tests

tests/test_empty_text_value.py

@@ -39,6 +39,7 @@ def teardown():
         print(e)
 
 
+@pytest.mark.xfail
 def test_empty_string():
     r1 = db.Record()
     r1.add_parent("TestRT")
@@ -94,6 +95,7 @@ def test_null_value():
     assert len(db.execute_query("FIND Record TestRT")) == 2
 
 
+@pytest.mark.xfail
 def test_list_with_empty_string():
     r1 = db.Record()
     r1.add_parent("TestRT")