Fixes crash when constructing NinePatch with null chunk data

Previously, ART runtime would crash checking the size of the
chunk array if it was null. Now we simply set the chunk size to
zero and fail with an exception, the same as when the array is not
large enough.

Test: NinePatchTest#testConstructor
Fixes: 189478462
Change-Id: I0352a9b6be1ce64c6a40ce8dffdaa146aacb7a03