fix(wallet): fix getting balance of custom tokens

Fixes #4040

src/app_service/service/wallet_account/service.nim

@@ -67,9 +67,13 @@ proc fetchTokenBalance(tokenAddress, accountAddress: string, decimals: int): flo
   if balanceCache.hasKey(key):
     return balanceCache[key]
 
+  try:
     let tokenBalanceResponse = status_go_eth.getTokenBalance(tokenAddress, accountAddress)
     result = parsefloat(hex2Balance(tokenBalanceResponse.result.getStr, decimals))
     balanceCache[key] = result
+  except Exception as e:
+    error "Error getting token balance", msg = e.msg
+  
 
 proc fetchEthBalance(accountAddress: string): float64 =
   let key = "0x0" & accountAddress