Saved Queries Page Doesn't Load After User Tries to Save a Blank Query

[yousoph]

When a user tries to save a blank query, the query doesn't get saved and the Save Queries page fails to load and shows an error.

Expected results

In SQL Lab, the user should either not be able to save a blank query or they should be able to save it properly.

Actual results

• When visiting the Saved Queries page, the page shows an error
• When returning to SQL Lab or refreshing the page, the query that the user tried to save is not properly saved

Screenshots

Saved Queries:

How to reproduce the bug

1. Go to SQL Lab
2. Make sure there is no text in the query
3. Click the "Save" button and enter a title

Environment

• superset version: master

Checklist

• I have checked the superset logs for python stacktraces and included it here as text if there are any.
• I have reproduced the issue with at least the latest released version of superset.
• I have checked the issue tracker for the same issue and I haven't found one similar.

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