Resolve "Crash in stereo decoding in DTX and bitrate switching"

Reason why this change is needed

  • Crash in stereo decoding in DTX and bitrate switching

Description of the change

  • Add check against handle being NULL.

Affected operating points

  • BE on most cases, solves a crash in DTX and bitrate switching at the decoder side.

Related to #1562 (closed)

Merge request reports

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