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

@@ -87,10 +87,10 @@ class TableTest(unittest.TestCase):
         # NaN is hard to compare, so we replace it by -999
         # autopep8: off
         assert result.replace(to_replace=nan, value=-999).to_dict() == {
-            'p1': {0: 1,    1: -999,         2: -999    },  # noqa: E202
-            'p3': {0: 23,   1: [30, 31],     2: -999    },  # noqa: E202
-            'p4': {0: [1],  1: [40.0, 41.0], 2: -999    },  # noqa: E202
-            'p2': {0: -999, 1: [20, 21],     2: -999    },  # noqa: E202
+            'p1': {0: 1,    1: -999,         2: -999},  # noqa: E202
+            'p3': {0: 23,   1: [30, 31],     2: -999},  # noqa: E202
+            'p4': {0: [1],  1: [40.0, 41.0], 2: -999},  # noqa: E202
+            'p2': {0: -999, 1: [20, 21],     2: -999},  # noqa: E202
             'p5': {0: -999, 1: -999,         2: [50, 51]}
         }
         # autopep8: on