fix floating point error in activation when T<-50C #3
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When running with debug = True the original code produces a floating point error due to attempt to take the sqrt of a negative number in NdParam.f on line 353
CF1 = 0.5*(((1/BET2)/(ALFA*WPARC))**0.5). This happens because the function calculating the vapor pressure is not defined for T < -50, thus it gives a negative Saturation vapor pressure. The fix ensure that no aerosols are activated for T < -50 there shouldn't either be any liquid available for activation either at this temperature.