Exception TypeError: "'NoneType' object is not callable" with Python 2.6.1+

Hi,
    I'm using Ubuntu Jaunty which ships with Python 2.6.1+ and everytime I run 
bakefile_gen I see

Exception TypeError: "'NoneType' object is not callable" in  ignored

printed right after a call to bakefile.
I managed to bisect the problem down to (apparently) updateTargets() in 
bakefile_gen.py.

With the attached patch I see:


frm@ubuntu:~/work/bakefile/tests$ bakefile_gen --verbose -f msvc -b 
headers/headers.bkl
loading task description from /home/frm/work/bakefile/tests/Bakefiles.bkgen... 

scanning directories for bakefiles... 

building rules... 

determining which makefiles are out of date... 

     ...1 out of 1 will be updated 

starting 

[1/1] generating msvc from headers/headers.bkl 

/usr/bin/python /usr/local/lib/bakefile/bakefile.py -fmsvc 
-DFORMAT_HAS_MAKE_INSTALL=1 --output-deps=/tmp/bakefile9BTwgU 
--output-changes=/tmp/bakefileQQonn1 --xml-cache=/tmp/bakefile2tHcS1/xmlcache0 
headers/headers.bkl 

checking 
 

endchecking 
 

... lots of checking/endchecking ...
starting
checking
endchecking
writing headers/makefile.vc
starting
checking
endchecking
Exception TypeError: "'NoneType' object is not callable" in  ignored
starting
checking
endchecking
1 files modified

so it looks like it's something in the while line (432) ?

Running bakefile separately (but without --xml-cache doesn't trigger the 
exception). Also if the makefile is already updated I get no exception just:

loading task description from /home/frm/work/bakefile/tests/Bakefiles.bkgen...
scanning directories for bakefiles...
building rules...
determining which makefiles are out of date...
     ...0 out of 1 will be updated
0 files modified

I should mention that this is not _critical_ (makefiles are still generated) but 
very annoying (gets repeated tons of times).

Francesco

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Index: src/bakefile_gen.py
===================================================================
--- src/bakefile_gen.py	(revisione 1295)
+++ src/bakefile_gen.py	(copia locale)
@@ -430,6 +430,7 @@
     try:
         try:
             while len(needUpdate) > 0 or childProcessesCnt > 0:
+                print 'starting'
                 # start new processes:
                 for p in range(0,jobs):
                     if len(needUpdate) > 0 and childProcesses[p] == None:
@@ -442,12 +443,15 @@
                         childProcesses[p].run()
 
                 # check for finished processes:
+                print 'checking'
                 for p in range(0,jobs):
                     pr = childProcesses[p]
                     if pr != None and pr.poll():
                         childProcessesCnt -= 1
                         childProcesses[p] = None
                         modifiedFiles += pr.finish()
+                print 'endchecking'
+                        
                 # FIXME: Unfortunately, Python's subprocess module doesn't
                 #        provide any way to get notified about child process'
                 #        termination, so we have to poll it. Wait a bit here to