ninjalog_uploader_wrapper.py: handle broken config file
ninjalog_uploader_wrapper.py: handle broken config file

This is to make the script work even when config file is broken.

Change-Id: I6c2a090b01026b5747137bcc9fdec0bd5c03f75e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3607373
Auto-Submit: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Reviewed-by: Fumitoshi Ukai <0e88e065dd7f7d7f11da28b068df91c65342563c@google.com>
Commit-Queue: Fumitoshi Ukai <0e88e065dd7f7d7f11da28b068df91c65342563c@google.com>

CoherentLabs/depot_tools,CoherentLabs/depot_tools