[telemetry] Add exception guards to StalePyc fixer.
[telemetry] Add exception guards to StalePyc fixer.

If you run multiple instances, it can have a race condition with itself. So, just ignore those errors.


BUG=272333
TEST=Run python and import perf_tools in src/tools/perf.

Review URL: https://chromiumcodereview.appspot.com/23498012

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@220266 0039d316-1c4b-4281-b951-d872f2087c98

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