Improve input validation in new batch window. about typica

[N3Roaster]

Items required: a valid roasted coffee item, at least one valid green coffee with weight (all green coffees should have a weight), some value in the roasted coffee weight, and recorded batch data for time, duration, and file. If any of these are missing, the submit button should not be enabled.

Setting a default value of 0 for roasted weight would eliminate what might be the most common cause of batch insert failures and ensuring that this value can be edited later makes it easier to get valid data into the database at facilities where weighing finished product weight at the roaster is inconvenient.

[N3Roaster]

Roasted weight now defaults to 0.

[N3Roaster]

It might still be possible to produce invalid input through the green coffees table but the level of validation introduced now should cover the most likely errors. There's still room for improvement in actually disabling the submit button instead of just throwing up an error message and making some allowances for database communication issues.