Dashboard Screenshot API Endpooint Gives and Error Message when a Dashboard is Empty or has no Charts

[yousoph]

Bug description

When a dashboard is empty OR has only text elements, when the user tries to send an API call to generate a screenshot, they get an error message instead of a screenshot

Repro steps:

1. Create a dashboard with just a title and save it OR create a dashboard with some text elements only and save it
2. Find the dashboard ID of the dashboard
3. Use the API to try to generate a screenshot for the dashboard

Use POST endpoint /api/v1/dashboard/{{DashboardID}}/cache_dashboard_screenshot/
By default, an empty array can be used as the request body to get the dashboard screenshot. Alternatively, it's possible to include below fields in the body:

• dataMask (array): Specifies the dataMask configuration (controls applied filters).
  

• activeTabs (list): Specify the tab(s) that should be included/selected.
  

• urlParams (list): List of URL params to be applied to the dashboard.
  

The request returns an image_url value, that can be used to download the dashboard. It's also possible to append ?download_format=pdf to download a PDF as opposed to an image.

Expected results

A blank or text-only dashboard image/PDF will be generated.

Actual results

{"message":"Not found"} error was shown.

Screenshots/recordings

No response

Superset version

master / latest-dev

Python version

3.9

Node version

16

Browser

Chrome

Additional context

No response

Checklist

• I have searched Superset docs and Slack and didn't find a solution to my problem.
• I have searched the GitHub issue tracker and didn't find a similar bug report.
• I have checked Superset's logs for errors and if I found a relevant Python stacktrace, I included it here as text in the "additional context" section.

[geido]

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[msyavuz]

Hey @geido, can i work on this?