Uncaught error when using non-numeric characters in TX amount

[axelchalon]

Steps to reproduce

• Contracts tab: select a contract
• Click Execute
• In Transaction value, enter a non-numeric character, blur

Expected result
Dapp doesn't crash

Actual result
Dapp crashes

dapp-develop/src/modals/ExecuteContract/DetailsStep/detailsStep.js

Lines 71 to 87 in 556c376

	<Input
	error={ amountError }
	hint={
	<FormattedMessage
	id='executeContract.details.amount.hint'
	defaultMessage='The amount to send to with the transaction'
	/>
	}
	label={
	<FormattedMessage
	id='executeContract.details.amount.label'
	defaultMessage='Transaction value (in ETH)'
	/>
	}
	onSubmit={ onAmountChange }
	value={ amount }
	/>

dapp-develop/src/modals/ExecuteContract/executeContract.js

Line 228 in 556c376

value: toWei(amount || 0)