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Return early if utf_text.data() == nullptr. utf_text.data() can be
nullptr if the Clipboard was empty. Previously, this would trigger a
DCHECK in Blob::Create().

Tested manually using `pbcopy < /dev/null`, as per bug repro steps.
Unfortunately, Chrome's test infra doesn't seem to have a way to
simulate clearing the clipboard. Therefore, there isn't an automated
test being added here to verify this behavior.

Bug: 1071279
Change-Id: I95cdc6ed2df25394ca1ffa78d4cde96782d9a10f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2151132
Commit-Queue: Darwin Huang <huangdarwin@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759794}