fix: loading service without error

src/app_service/service/setting/dto.nim

@@ -20,6 +20,7 @@ type
 
 proc toSettingDto*(jsonObj: JsonNode): SettingDto =
   result = SettingDto()
+
   discard jsonObj.getProp("signing-phrase", result.signingPhrase)
   if not jsonObj.getProp("currency", result.currency):
     result.currency = DEFAULT_CURRENCY
@@ -43,8 +44,8 @@ proc toSettingDto*(jsonObj: JsonNode): SettingDto =
     break
 
   result.activeTokenSymbols = @[]
+  if jsonObj.hasKey("wallet/visible-tokens"):
     let symbols =  parseJson(jsonObj{"wallet/visible-tokens"}.getStr)
     for symbol in symbols{$result.currentNetwork.id}.getElems():
       result.activeTokenSymbols.add(symbol.getStr)
 
-