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Last week, a CL landed that contained a gtest with an empty test name,
e.g.

  TEST(FooTest, )

This broke our gtest-list-tests parsing logic because it saw this:

  FooTest.

    testBar

and incorrectly handled the line containing only spaces. This patch
fixes the handling of that case.

Review-Url: https://codereview.chromium.org/2582263003
Cr-Commit-Position: refs/heads/master@{#439507}