Generating font data fails

[Fingolfin1196]

When trying to generate the font data for one of the preconfigured fonts (in this case Latin Modern) using make Latin-Modern, the generation runs for quite some time before failing with the following error message (that I have cleaned up a little bit):

Traceback (most recent call last):
  File "splitFont.py", line 782, in <module>
    raise BaseException("Unable to find the glyph " + glyph.glyphname)
BaseException: Unable to find the glyph space
make: *** [Makefile:47: Latin-Modern/HTML-CSS/fontdata.js] Error 1

This is after fixing a few issues with the scripts and configuring the options so that most of the process works, but for some reason, it can't find the space character.