test.py: check ubconfig exists before using it

Set ubconfig to None and add a check in the show_timings() function of
test/py/test.py to ensure that the global ubconfig variable was actually
initialized before access attributes.

If tests fail early, e.g. because --build failed, ubconfig may not have
been initialized yet and results in an exception in an atexit handler.
Adding this check avoids unnecessary noise in the output.

    Exception ignored in atexit callback: <function cleanup at 0x7de475ea6b60>
    Traceback (most recent call last):
    File "u-boot/test/py/conftest.py", line 669, in cleanup
        show_timings()
    File "u-boot/test/py/conftest.py", line 616, in show_timings
        if ubconfig.timing:
        ^^^^^^^^
    NameError: name 'ubconfig' is not defined

Tested-by: Mattijs Korpershoek <[email protected]> # sandbox
Reviewed-by: Mattijs Korpershoek <[email protected]>
Signed-off-by: David Lechner <[email protected]>

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