Handle new Notion's databases

[mathix420]

Discussed in https://github.com/mathix420/notion-charts/discussions/25

^{Originally posted by Ravie13 March 18, 2022} Hi there - this looks like just the code I need! I followed the directions for a private notion page and ran it but I'm getting errors in the console. I'm wondering if it is because of the recent Notion Database updates?

Failed to load resource: the server responded with a status of 500 ()
(index):203 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'map')
    at (index):203:34

At that index in the code this is the function:

 json.columns.map(function (column) {
                        const opt = document.createElement('option');
                        opt.innerText = column.name;
                        opt.value = column.id;
                        return opt;
                    }).forEach(function (child) {
                        fields.appendChild(child);
                        firstColumnSav = firstColumn.cloneNode(true);
                        firstColumnSav.querySelector('input').value = '';
                    });
```</div>