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Before this patch, empty strings would be filtered before sent to the
UI. The result of that was some tell_actions with single space ' '
messages to clear the status bar. This patch removes that constraint and
empty strings will just remove the status message shown.

As I drive by there's now a unittest for the tell action, even if that's
going the wrong way in the stack ...

R=arbesser@google.com

Bug: b/143757287
Change-Id: I843a0cf36e246c4480de4ffa8fe59709ef576bd7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1911211
Commit-Queue: Mathias Carlen <mcarlen@chromium.org>
Reviewed-by: Clemens Arbesser <arbesser@google.com>
Cr-Commit-Position: refs/heads/master@{#715240}