NSTEPS value not returned

Hello everyone,

I 've a question about the best way to recover the number of timestep for a predict run calculation with your library ? I've tried to do this but the function return `None` as the `DoCmd()` method cannot return a value but in the Openserver documentation when the `GAP.PREDINIT()` is performed normally the command return the number of timestep, here below my code:

`
C.DoSet('GAP.MOD[{PROD}].PREDINFO.START.DATESTR','{01/01/2007}')
C.DoSet('GAP.MOD[{PROD}].PREDINFO.END.DATESTR','{01/01/2018}')
C.DoSet('GAP.MOD[{PROD}].PREDINFO.STEPTYPE','YEARS')
C.DoSet('GAP.MOD[{PROD}].PREDINFO.STEP.DATESTR',2)
C.DoSet('GAP.MOD[{PROD}].PredictionOptimiseMode','OptRBNS')
steps = C.DoCmd('GAP.PREDINIT()')
print(steps)`

Thank you for your help.