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- Return early if icon store input is empty. Avoid calls to protodb.

Bug: 963290
Change-Id: Ic037a5853c81afdfc74c95126f86f961f6adbd36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1793751Reviewed-by: Xing Liu <xingliu@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Hesen Zhang <hesen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695352}