[alert]can't add alerts and reports

[code-snail]

can't add alerts and reports

[code-snail]

[dpgaspar]

@code-snail thank you for reporting it, could you please fill up the github issue bug template?

[code-snail]

@dpgaspar
can't add new alert and report

Expected results

expect to add new alert or report

Actual results

actually, the ADD button is disabled.

Screenshots

If applicable, add screenshots to help explain your problem.

How to reproduce the bug

add alerts or reports: Settings -> Alerts&Reports -> +ALERT or +REPORT

Environment

• docker image: apache/superset:latest
• superset version: Superset 0.999.0dev
• python version: Python 3.7.9

[nytai]

I did some poking around, it seems this issue only happens for production frontend builds (ie, npm run build)