Bubble Size should not be required for World Map visualization

[emlittleworth]

• [√ ] I have checked the superset logs for python stacktraces and included it here as text if 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

Superset version

0.26.3

Expected results

I should be able to use the World Map visualization without expanding the "Bubbles" section and selecting the "Bubble size" dropdown.

Actual results

It is required even when "Show Bubbles" isn't selected. The newly added validation is useful so people don't run into issues (for example: #5171, #4371, #2361) but it doesn't make sense to enforce this when "Show Bubbles" is unchecked.

Steps to reproduce

Use the World Map visualization.

[Manikandan25]

If you unchecked Show Bubbles, it shouldn't ask for a column to represent bubble size.
If you need the bubbles of same size, you can fill in the custom sql as 1 (or some other numbers).
If you don't need any bubbles, for now , you can fill the custom sql as 1 and uncheck the Show Bubbles.
Check the image , I have attached

[emlittleworth]

Yeah I understand the workaround but created the issue because I feel the interaction should change. It'd be ideal to not have to fill in "Bubble size" if "Show Bubbles" is unchecked. The validation error in red in the screenshot I added shows that it is being enforced regardless of the state of "Show Bubbles."

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