Multi-series strategy

[joanNT]

Hi!

Is there any statement or method to allow a strategy know when all series added have had an incoming close or tick? I mean, I'm using the Closes[x][0] and sometimes when there is no action in the markets for one instrument, the Closes launches an error by refering to a array that has no input, I know that I can do this by developing some boolean variables that analizes when has come a input for an Instrument, but perhaps there is something better.

Thanks