When using assetList function, if LOOKBACK history(t6) file of specific asset does not exist, zorro don't try to load further assets in the asset list.
for example, when specify one year backtesting as follow,

StartDate = 20200101;
EndDate = 20201231;
BarPeriod = 1440;
LookBack = 30;
...
if(Init) {
History = HISTORY_PATH;
assetList(ASSETS_LIST_PATH, 0);
}
...

Lookback period is 20191201 ~ 20191231.
BUT if there is no t6 file of specific asset exist, (****_2019.t6)
assetList generate error, and does not try to load further asset list, as a result there is missing assets.

I think even if some assets not have enough history data, they must not casuse other assets not loading correctly.

Please fix this problem.