AAC decoding test: fail instead of NPE on output format

When a key fails to be found on the decoder output format, it
causes an NPE. Catch the exception and report a test failure
instead

Bug: 235105712
Test: atest android.media.decoder.cts.DecoderTestAacFormat
Change-Id: I45624e44ae5aaea2c16dfd4ae3239efa383f7181
1 file changed