Regression on external GASNET build tree

John's latest commit of c306072 has broken operation for external GASNET build tree:
$ export GASNET=/home/bonachea/UPC/bupcr-ex/dbg/gasnet DBGSYM=1 OPTLEV=0 ; nobs exe test/dist_object.cpp
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Uncaught exception

Traceback (most recent call last):
  File "/home/bonachea/UPC/upcxx/nobs/nobs/tool_main.py", line 87, in main
    printed.wait()
  File "/home/bonachea/UPC/upcxx/nobs/nobs/async.py", line 403, in wait
    return me.wait_futurized().value()
  File "/home/bonachea/UPC/upcxx/nobs/nobs/async.py", line 707, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 458, in memo_execute
    yield result
  File "/home/bonachea/UPC/upcxx/nobs/nobs/async.py", line 707, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/bonachea/UPC/upcxx/nobsrule.py", line 480, in execute
    objs, libset = yield me.crawl()
  File "/home/bonachea/UPC/upcxx/nobs/nobs/async.py", line 707, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/bonachea/UPC/upcxx/nobsrule.py", line 459, in crawl
    yield fresh_src(main_src)
  File "/home/bonachea/UPC/upcxx/nobs/nobs/async.py", line 557, in fire1
    proxied = lam(arg_result)
  File "/home/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 540, in result
    return resultoid()
  File "/home/bonachea/UPC/upcxx/nobs/nobs/async.py", line 707, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 458, in memo_execute
    yield result
  File "/home/bonachea/UPC/upcxx/nobs/nobs/async.py", line 707, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/bonachea/UPC/upcxx/nobsrule.py", line 349, in execute
    comp_pp, src = yield me.get_comp_pp_and_src()
  File "/home/bonachea/UPC/upcxx/nobs/nobs/async.py", line 557, in fire1
    proxied = lam(arg_result)
  File "/home/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 540, in result
    return resultoid()
  File "/home/bonachea/UPC/upcxx/nobs/nobs/async.py", line 707, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/bonachea/UPC/upcxx/nobsrule.py", line 344, in get_comp_pp_and_src
    comp_pp = yield cxt.comp_lang_pp(src)
  File "/home/bonachea/UPC/upcxx/nobs/nobs/async.py", line 707, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/bonachea/UPC/upcxx/nobsrule.py", line 175, in comp_lang_pp
    libs = yield cxt.libraries(src)
  File "/home/bonachea/UPC/upcxx/nobs/nobs/async.py", line 707, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/bonachea/UPC/upcxx/nobsrule.py", line 281, in libraries
    maybe_upcxx_backend = yield cxt.upcxx_backend()
  File "/home/bonachea/UPC/upcxx/nobs/nobs/async.py", line 707, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/bonachea/UPC/upcxx/nobsrule.py", line 201, in upcxx_backend
    gasnet = yield cxt.gasnet()
  File "/home/bonachea/UPC/upcxx/nobs/nobs/async.py", line 707, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 398, in memo_execute
    yield failure
  File "/home/bonachea/UPC/upcxx/nobs/nobs/async.py", line 705, in fire
    arg = gen_send(arg.value())
  File "/home/bonachea/UPC/upcxx/nobsrule.py", line 820, in execute
    incfiles = [os.path.join(source_dir, i) for i in incfiles]
  File "/usr/lib/python2.7/posixpath.py", line 70, in join
    elif path == '' or path.endswith('/'):
AttributeError: 'NoneType' object has no attribute 'endswith'
The same command works with the previous version 038c987
This appears to only affect external GASNET build trees, not install trees, but it would be preferable to support either.
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