T3385

Many validation checks on Send screen -- together with desire to not show validation errors when user first loads the screen -- have made this set of conditions complex.

Store in single variable and add comments.

Disable send on page initial load state, which is not valid. Because isNaN('') === false (TIL), add condition for this check (prevents case of address being entered, value not yet entered -- button is enabled and you can still get a nonsense modal).

npm test

npm start, navigate to send screen. Button should be disabled. Enter valid address. Button still disabled. Enter valid amount. Button enabled.

Enter valid multisend, valid msg input.