Description:    Fix an exception when a null command-line argument is passed in.
Upstream bug:   http://scons.tigris.org/issues/show_bug.cgi?id=2368
Ubuntu bug:     https://launchpad.net/bugs/338492

Index: scons-1.2.0/engine/SCons/Script/Main.py
===================================================================
--- scons-1.2.0.orig/engine/SCons/Script/Main.py	2009-03-06 08:13:35.000000000 +0000
+++ scons-1.2.0/engine/SCons/Script/Main.py	2009-03-06 08:13:57.000000000 +0000
@@ -869,7 +869,7 @@
     targets = []
     xmit_args = []
     for a in parser.largs:
-        if a[0] == '-':
+        if a[:1] == '-':
             continue
         if '=' in a:
             xmit_args.append(a)