6.1.0rc1 - Empty filters generating unnecessary WHERE clauses on Chart's queries #38701

Bug description

Chart's queries are being generated with a unnecessary WHERE 1 = 1 clause when there's an empty time filter assigned to the chart. In some DB engines this clause gets generated as WHERE TRUE = 1 what leads the chart to error out.

Screenshots/recordings

Superset version

6.0.0

Python version

3.10

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.