Fix uncaught exception in recipes related to self._test_runs[suffix]
Fix uncaught exception in recipes related to self._test_runs[suffix]

Example: http://build.chromium.org/p/tryserver.chromium.win/builders/win8_chromium_rel/builds/13159

BUG=none

Review URL: https://codereview.chromium.org/604763004

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@292166 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build