cannot use enpkg in canopy on Centos5

Here is the traceback.

18:52:34 1015> export ENSTALLER_DEBUG=1
18:52:45 1016> enpkg enstaller
Traceback (most recent call last):
File "/opt/kitchingroup/CANOPY/Canopy_64bit/User/bin/enpkg", line 10, in
sys.exit(main_noexc())
File "/opt/kitchingroup/CANOPY/Canopy_64bit/User/lib/python2.7/site-packages/enstaller/main.py", line 844, in main_noexc
main(argv)
File "/opt/kitchingroup/CANOPY/Canopy_64bit/User/lib/python2.7/site-packages/enstaller/main.py", line 597, in main
config = Configuration.from_file(config_filename)
File "/opt/kitchingroup/CANOPY/Canopy_64bit/User/lib/python2.7/site-packages/enstaller/config.py", line 344, in from_file
ret = _create(fp)
File "/opt/kitchingroup/CANOPY/Canopy_64bit/User/lib/python2.7/site-packages/enstaller/config.py", line 329, in _create
parsed = parse_assignments(fp)
File "/opt/kitchingroup/CANOPY/Canopy_64bit/User/lib/python2.7/site-packages/egginst/utils.py", line 200, in parse_assignments
return _AssignmentParser().parse(file_or_filename.read())
File "/opt/kitchingroup/CANOPY/Canopy_64bit/User/lib/python2.7/site-packages/egginst/utils.py", line 165, in parse
root = ast.parse(s)
File "/opt/kitchingroup/CANOPY/appdata/canopy-1.5.1.2730.rh5-x86_64/lib/python2.7/ast.py", line 37, in parse
return compile(source, filename, mode, PyCF_ONLY_AST)
TypeError: compile() expected string without null bytes

Reproduce `enpkg enstaller` on CentOS 5 with `ENSTALLER_DEBUG=1`, then inspect `enstaller/main.py`, `enstaller/config.py`, and `egginst/utils.py` at the traceback locations. Done means the command no longer fails with `TypeError: compile() expected string without null bytes` and can proceed normally.

Written by the indexing model from the issue text.