This CL avoids that unpack_aecdump produces an empty callorder.char file
regardless of it not writing any data to that file
Bug: webrtc:5298
Change-Id: I15b01764a0dc16045346dd680e9bd4c1869c0d2c
Reviewed-on: https://webrtc-review.googlesource.com/c/98340
Reviewed-by: Oleh Prypin <oprypin@webrtc.org>
Reviewed-by: Sam Zackrisson <saza@webrtc.org>
Commit-Queue: Per Åhgren <peah@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25214}