oeqa/core/context: Use a default iterable modules object

The OETestLoader.modules must be an iterable object, otherwise
checking presence of specific modules with the 'in' operator fails
with the following command/error:

    % oe-test core
    .. - core - INFO - Running bitbake -p
    Traceback (most recent call last):
      File "..poky2/scripts/oe-test", line 108, in <module>
        ret = main()
      File "..poky2/scripts/oe-test", line 93, in main
        results = args.func(logger, args)
      File "..poky2/meta/lib/oeqa/core/context.py", line 235, in run
        self.tc.loadTests(self.module_paths, **self.tc_kwargs['load'])
      File "..poky2/meta/lib/oeqa/core/context.py", line 53, in loadTests
        self.suites = self.loader.discover()
      File "..poky2/meta/lib/oeqa/core/loader.py", line 204, in discover
        pattern='*.py', top_level_dir=path)
      File "/usr/lib64/python3.4/unittest/loader.py", line 275, in discover
        tests = list(self._find_tests(start_dir, pattern))
      File "/usr/lib64/python3.4/unittest/loader.py", line 339, in _find_tests
        yield self.loadTestsFromModule(module)
      File "..poky2/meta/lib/oeqa/core/loader.py", line 266, in loadTestsFromModule
        and module.__name__ in self.modules \
    TypeError: argument of type 'NoneType' is not iterable

Signed-off-by: Leonardo Sandoval <leonardo.sandoval.gonzalez@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions