[ios] Only Add Optional Text if Exists in ClearBrowsingDataItem

optionalTextLabel always exists, but it does not always have text.
Currently adds that empty string to the array used to construct
the accessibilityValue. Now only add it to the returned string if
there is text.

Bug: 937016
Change-Id: I43d28777ed9ee872bebf741db985d49280b21c11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1525272
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641077}
1 file changed