Philipp Wollermann c3d210d605 post_build_ninja_summary.py: Gracefully handle empty .ninja_log files ...

These are currently produced by Siso, until b/298594790 is addressed.

Before:
$ post_build_ninja_summary.py -C out/fastbuild-siso-reclient
Traceback (most recent call last):
  File "/usr/local/google/home/philwo/depot_tools/post_build_ninja_summary.py", line 366, in <module>
    sys.exit(main())
             ^^^^^^
  File "/usr/local/google/home/philwo/depot_tools/post_build_ninja_summary.py", line 356, in main
    entries = ReadTargets(log, False)
              ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/google/home/philwo/depot_tools/post_build_ninja_summary.py", line 123, in ReadTargets
    assert header == '# ninja log v5\n', \
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: unrecognized ninja log version ''

After:
$ post_build_ninja_summary.py -C out/fastbuild-siso-reclient
<nothing>

Bug: b/298594790
Fixed: b/297349353
Change-Id: I10d4613e7386707276003fe0fd05cb5b0914be46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/4846349
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Auto-Submit: Philipp Wollermann <philwo@google.com>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>

2023-09-07 16:11:00 +00:00

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