fix: handle cases where document is null in getTables

[mediaupstream]

this is to address an edge case where document can sometimes be undefined, issue: AXM-2504.

NOTE: do we need to build and publish these changes? I wonder what's required for getting this change into the frontend

[kevinehosford]

Nice job! Yes, you can build this by running this script from within the package dir:

monaco-kusto/package/package.json

Line 28 in b5eac13

"make_package": "npm run prepublishOnly && cp ./package.json ../package.json && cp -r ./release ../",

.

When this lands, update app/frontend/package.json monaco-kuto dependency to point to the latest git commit:
https://github.com/axiomhq/app/blob/615599ab28dba23449e86566f6093c4fcef16eb0/frontend/package.json#L23