[dapp-kit] ensure that wallet-icon is a non-empty string (#20304)

## Description 

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## Test plan 

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---

## Release notes

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.changeset/violet-ants-attend.md

@@ -0,0 +1,5 @@
+---
+'@mysten/dapp-kit': patch
+---
+
+Ensure wallet-icon is a non-empty string before rendering

sdk/dapp-kit/src/components/connect-modal/views/ConnectionStatus.tsx

@@ -21,11 +21,13 @@ export function ConnectionStatus({
 }: ConnectionStatusProps) {
 	return (
 		<div className={styles.container}>
-			<img
-				className={styles.walletIcon}
-				src={selectedWallet.icon}
-				alt={`${selectedWallet.name} logo`}
-			/>
+			{selectedWallet.icon && (
+				<img
+					className={styles.walletIcon}
+					src={selectedWallet.icon}
+					alt={`${selectedWallet.name} logo`}
+				/>
+			)}
 			<div className={styles.title}>
 				<Heading as="h2" size="xl">
 					Opening {selectedWallet.name}

sdk/dapp-kit/src/components/connect-modal/wallet-list/WalletListItem.tsx

@@ -22,7 +22,7 @@ export function WalletListItem({ name, icon, onClick, isSelected = false }: Wall
 				type="button"
 				onClick={onClick}
 			>
-				{typeof icon === 'string' ? (
+				{icon && typeof icon === 'string' ? (
 					<img className={styles.walletIcon} src={icon} alt={`${name} logo`} />
 				) : (
 					icon