* tools/dev/trails.py     (parse_trails_log): Specifically handle invalid input.  Warn when empty     trails are encountered.  Empty trails usually suggest that a non-clean     build was performed with -DSVN_FS__TRAIL_DEBUG.     (output_trail): Handle empty trails.
* tools/dev/trails.py
 
  (parse_trails_log): Specifically handle invalid input.  Warn when empty
    trails are encountered.  Empty trails usually suggest that a non-clean
    build was performed with -DSVN_FS__TRAIL_DEBUG.
 
  (output_trail): Handle empty trails.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@847221 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion