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1. Start MySQL (set empty password). 2. Start IDE. MySQL will be automatically registered. 3. Create PHP project. 4. Press Alt+Insert and choose "Connection to Database...". 5. Select in dropdown list registered MySQL (should be something like "jdbc:mysql://localhost:3306 [root on Default schema]"). Result: "The password for the selected connection is unknown." message appears and "OK" button is disabled, since empty password should work.
I guess this needs to be fixed in the database area. We need a way to distinguish between "unknown password" and "known, but empty". Perhaps use null for the former and empty string for the latter.
I think this is too risky to fix for 6.5, since it affects connection management. I do not think it is an important issue to begin with, since I do not think many users have empty passwords.
Will reconsider fixing this in 7.0 if we see some user reports around it. I'm not sure how important supporting empty passwords is.
Reassigned to new owner.
No in plans to fix it.