Fix value validator in send custom transaction

src/routes/safe/components/Balances/SendModal/screens/ReviewCustomTx/index.jsx

@@ -116,8 +116,8 @@ const ReviewCustomTx = ({
             <Row margin="md" align="center">
               <Img src={getEthAsToken().logoUri} height={28} alt="Ether" onError={setImageToPlaceholder} />
               <Paragraph size="md" noMargin className={classes.value}>
-                {tx.value}
-                {'ETH'}
+                {tx.value || 0}
+                {' ETH'}
               </Paragraph>
             </Row>
             <Row margin="xs">

src/routes/safe/components/Balances/SendModal/screens/SendCustomTx/index.jsx

@@ -20,7 +20,6 @@ import {
   composeValidators,
   mustBeFloat,
   maxValue,
-  greaterThan,
 } from '~/components/forms/validator'
 import SafeInfo from '~/routes/safe/components/Balances/SendModal/SafeInfo'
 import ArrowDown from '../assets/arrow-down.svg'
@@ -126,7 +125,6 @@ const SendCustomTx = ({
                       type="text"
                       validate={composeValidators(
                         mustBeFloat,
-                        greaterThan(0),
                         maxValue(ethBalance),
                       )}
                       placeholder="Value*"