[Telemetry] Don't display "Locals:" header if there are no locals to print.
[Telemetry] Don't display "Locals:" header if there are no locals to print.

Doing the 'self' exclusion in the loop was too late.

BUG=

Review URL: https://codereview.chromium.org/94033003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@238192 0039d316-1c4b-4281-b951-d872f2087c98

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