FIX: `to_table` failed on lists

Summary

Fix for #117 (closed)

Focus

• Performance
• Sufficient test

Test Environment

Run the unit test:

pytest --pdb --pdbcls=IPython.terminal.debugger:TerminalPdb unittests/test_table_converter.py::TableTest::test_list

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unittests/test_table_converter.py

@@ -65,6 +65,18 @@ class TableTest(unittest.TestCase):
         c.extend([r1, r2])
         self.assertRaises(ValueError, to_table, c)
 
+    def test_list(self):
+        r1 = db.Record()
+        r1.add_parent("no1")
+        r1.add_property("p1")
+        r2 = db.Record()
+        r2.add_parent("no1")
+        r2.add_property("p1")
+        r2.add_property("p2", value=[1, 2])
+        c = db.Container()
+        c.extend([r1, r2])
+        to_table(c)
+
 
 class FromTsvTest(unittest.TestCase):
     def test_basic(self):