Division by zero when defined top soil layer base depth (SLB) greater than bottom ones

[fabiooliveira72]

This issue is related to the model behavior when changing SLB in the soil profile. See example below, where SLB is 25 for first layer and 20 for second layer:

@  SLB  SLMH  SLLL  SDUL  SSAT  SRGF  SSKS  SBDM  SLOC  SLCL  SLSI  SLCF  SLNI  SLHW  SLHB  SCEC    
    25   -99  .181  .239  .314 1.000   .81  1.52  2.03  18.0  31.0   2.5 -99.0   6.4 -99.0 -99.0
    20   -99  .181  .239  .314 1.000   .81  1.52  2.03  18.0  31.0   2.5 -99.0   6.4 -99.0 -99.0    
    30   -99  .181  .239  .314 1.000   .81  1.52  2.03  18.0  31.0   2.5 -99.0   6.4 -99.0 -99.0