Raph Levien b68d147b86 Allow null string to BidiFormatter#unicodeWrap
The BidiFormatter#unicodeWrap() methods allow null string, but the
toString() call on the result in the refactored code was crashing.
Also adds @Nullable annotations.

Bug: 27124532
Change-Id: I25922d104587af4a850c3640987af9315c3d3bde
2016-02-10 17:00:22 -08:00
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