fix(@desktop/wallet): Wallet - Send - Crash after opening send modal

The error seen in the bug is linked to getSuggestedFees returning an rpc error that was unhandled, I think this should resolve this issue.

fixes #6801

src/app_service/service/transaction/service.nim

@@ -370,6 +370,7 @@ QtObject:
     return self.transferTokens(from_addr, to_addr, assetSymbol, value, gas, gasPrice, maxPriorityFeePerGas, maxFeePerGas, password, chainId, uuid, eip1559Enabled)
 
   proc suggestedFees*(self: Service, chainId: int): SuggestedFees =
+    try:
       let response = eth.suggestedFees(chainId).result
       return SuggestedFees(
         gasPrice: parseFloat(response{"gasPrice"}.getStr),
@@ -380,12 +381,17 @@ QtObject:
         maxFeePerGasH: parseFloat(response{"maxFeePerGasHigh"}.getStr),
         eip1559Enabled: response{"eip1559Enabled"}.getbool,
       )
+    except Exception as e:
+      error "Error getting suggested fees", msg = e.msg
 
   proc suggestedRoutes*(self: Service, account: string, amount: float64, token: string, disabledChainIDs: seq[uint64]): SuggestedRoutes =
+    try:
       let response = eth.suggestedRoutes(account, amount, token, disabledChainIDs)
       return SuggestedRoutes(
         networks: Json.decode($response.result{"networks"}, seq[NetworkDto])
       )
+    except Exception as e:
+      error "Error getting suggested routes", msg = e.msg
 
   proc fetchCryptoServices*(self: Service): seq[CryptoRampDto] =
     try: