scons --help does not work if no compilers are found

[Former user]

If no compilers are installed/found by parts, but there is an SConstruct that imports parts via:

from parts import *

scons immediately exits with:

scons: *** No version of MSVC was found on the system for target win32-x86_64

Expected behavior: Parts specific help should be printed.

Reproduction: use hello sample provided with parts without any compilers installed, invoke scons --help

[Jason Kenny]

We talked about this off line. The issue was you had a bad install. The use of --help if for usage, not reporting info. However this is a feature that needs to be added better as it really useful to have information about why something is not found, be it a mistake in Parts or in this case something wrong (ie bad install) on the system.