Avoid division-by-zero when tmap search returns two tmap entries

with the same vobu_idx (which can happen at the end of a title).
4 jobs for fix-timesearch in 2 minutes and 17 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Build
passed #297233
amd64 debian
build-debian

00:00:39

failed #297234
macos
build-macos

00:00:20

passed #297236
win32 amd64 debian
build-win32

00:01:53

passed #297235
win64 amd64 debian
build-win64

00:02:16

 
Name Stage Failure
failed
build-macos Build
 using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
the bundle, the certificate verification probably failed due to a
problem with the certificate (it might be expired, or the name might
not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
the -k (or --insecure) option.
HTTPS-proxy has similar options --proxy-cacert and --proxy-insecure.
ERROR: Job failed: Process exited with: 1. Reason was: ()