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Thanks for tackling this. It's been bugging me almost daily this past week, but as usual when this bug is in my face I had no time to actually work on a fix.
I applied this patch to default, put an invalid import in test_os, and this is the result:
rdmurray@pydev:~/python/p35>./python -m unittest test.test_os
Traceback (most recent call last):
 File "/home/rdmurray/python/p35/Lib/unittest/loader.py", line 140, in loadTestsFromName
 module = __import__(module_name)
 File "/home/rdmurray/python/p35/Lib/test/test_os.py", line 5, in <module>
 import foobar
ImportError: No module named 'foobar'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
 File "/home/rdmurray/python/p35/Lib/runpy.py", line 170, in _run_module_as_main
 "__main__", mod_spec)
 File "/home/rdmurray/python/p35/Lib/runpy.py", line 85, in _run_code
 exec(code, run_globals)
 File "/home/rdmurray/python/p35/Lib/unittest/__main__.py", line 18, in <module>
 main(module=None)
 File "/home/rdmurray/python/p35/Lib/unittest/main.py", line 92, in __init__
 self.parseArgs(argv)
 File "/home/rdmurray/python/p35/Lib/unittest/main.py", line 139, in parseArgs
 self.createTests()
 File "/home/rdmurray/python/p35/Lib/unittest/main.py", line 146, in createTests
 self.module)
 File "/home/rdmurray/python/p35/Lib/unittest/loader.py", line 202, in loadTestsFromNames
 suites = [self.loadTestsFromName(name, module) for name in names]
 File "/home/rdmurray/python/p35/Lib/unittest/loader.py", line 202, in <listcomp>
 suites = [self.loadTestsFromName(name, module) for name in names]
 File "/home/rdmurray/python/p35/Lib/unittest/loader.py", line 145, in loadTestsFromName
 next_attribute, self.suiteClass)
ValueError: need more than 1 value to unpack
I get similar errors if I misspell the module name in on the command line.
From my point of view this is still an improvement over the status quo, but I don't think it is what you had in mind :).