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This change modifies all call sites in PPD metadata parsing functions
to only check that ParseJsonAndUnnestKey() returns something that is not
base::nullopt. ParseJsonAndUnnestKey() already returns nullopt instead
of any empty container, so there's no need to double-check that the
base::Value is not empty.

Bug: chromium:888189
Test: chromeos_unittests --gtest_filter='PpdMetadataParserTest.*'
Change-Id: I057b6aab97dc6cc2477488a0238ecced726d06a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378403
Commit-Queue: Kalvin Lee <kdlee@chromium.org>
Reviewed-by: Luum Habtemariam <luum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808117}