RNN-T confidence and alignment bugfix (#7381)

[GNroy]

• new frame_confidence and alignments lists are now always created after the while loop

Signed-off-by: Aleksandr Laptev [email protected]

• tests added

Signed-off-by: Aleksandr Laptev [email protected]

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Signed-off-by: Aleksandr Laptev [email protected]
(cherry picked from commit 6012ca2)

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[titu1994]

Thanks for the fix again !