Why doesn't optics2rad produce any output when I try to convert the optics Radiance file?

edit

As I understand the best process for getting a glazing system created in LBNL optics into Radiance is to export the Radiance file from optics, then run that file through optics2rad. This works for most systems, but I only get a header when I run the script on the following system:

#
# FileName= GlzSys.usr
# Product Name= 
# NFRC ID= 30000
# Manufacturer Name= User
# Glazing Type= Glazing system
# Coated Side= Neither
# Transmittance= 0.393
# Front Reflectance= 0.143
# Back Reflectance= 0.096
# Thickness(mm)= 3.251
# Appearance= 
#

void  glass       Existing_TruVue40_glass
0
0
3     0.398     0.440     0.430

void  BRTDfunc    Existing_TruVue40_front
10
      0.163     0.139     0.105
      0.365     0.404     0.394
      0 0 0
      .
0
9 0 0 0 0 0 0 0 0 0

void  BRTDfunc    Existing_TruVue40_back
10
      0.102     0.095     0.083
      0.365     0.404     0.394
      0 0 0
      .
0
9 0 0 0 0 0 0 0 0 0

When I run optics2rad on this file I get the following header output without the expected Radiance BRTDfunc definition:

# Output generated by /Applications/Radiance/current/bin/optics2rad from Existing_TruVue40.rad
#
# FileName= GlzSys.usr
# Product Name= 
# NFRC ID= 30000
# Manufacturer Name= User
# Glazing Type= Glazing system
# Coated Side= Neither
# Transmittance= 0.393
# Front Reflectance= 0.143
# Back Reflectance= 0.096
# Thickness(mm)= 3.251
# Appearance= 
#