Modify empty return values for charts and figures

[ddl-wasanthag]

What issue does this pull request solve?

10/22/2024 1:49 PM : raise SchemaLengthValidationError(value, full_schema, path, expected_len)
10/22/2024 1:49 PM : dash._grouping.SchemaLengthValidationError: Schema: [<Output billing_select.options>, <Output project_select.options>, <Output user_select.options>, <Output totalcard.children>, <Output cloudcard.children>, <Output computecard.children>, <Output storagecard.children>, <Output cumulative-daily-costs.figure>, <Output user_chart.figure>, <Output project_chart.figure>, <Output org_chart.figure>, <Output tag_chart.figure>, <Output workload-cost-table-container.children>]
10/22/2024 1:49 PM : Path: ()
10/22/2024 1:49 PM : Expected length: 13
10/22/2024 1:49 PM : Received value of length 12:
10/22/2024 1:49 PM : [[], [], [], 'No data', 'No data', 'No data', {}, None, None, None, None, None]

What is the solution?

Update the return values for no allocations charts and figures from None to {}.

Where should reviewer start?

update function in the domino-cost/cost_dashboard.py

Pull Request Reminders

• Has relevant documentation been updated?
• Has the JIRA ticket(s) been linked above?

References (optional)

https://dominodatalab.slack.com/archives/C064ZP999FW/p1729536218150729