dvdunauthor: possible bug when having "No VTS_TMAPT available - skipping"

hello,

I'm using dvdunauthor for demuxing a DVD so my kids can watch the 
different episode of their cartoon on a tablet (I thanks the authors for 
the only tool I found for this task when multiple episodes are mixed in 
one DVD when opening and ending of each episode are split ...)

Today, it failed with the following trace (I'm using ubuntu 12.04).
The application exit just after extracting too few vobs

    $ dvdunauthor /media/TSAWYER_01_SCN/VIDEO_TS/
    DVDAuthor::dvdunauthor, version 0.7.0.
    Build options: gnugetopt imagemagick iconv freetype fribidi fontconfig
    Send bug reports to <dvdauthor-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>

    libdvdread: Using libdvdcss version 1.2.12 for DVD access
    libdvdread: Attempting to use device /dev/sr0 mounted on
    /media/TSAWYER_01_SCN for CSS authentication


    INFO: VMGM

    libdvdread: Attempting to retrieve all CSS keys
    libdvdread: This can take a _long_ time, please be patient

    libdvdread: Get key for /VIDEO_TS/VIDEO_TS.VOB at 0x00000128
    libdvdread: Elapsed time 0
    libdvdread: Get key for /VIDEO_TS/VTS_01_1.VOB at 0x00002d3d
    libdvdread: Elapsed time 0
    libdvdread: Get key for /VIDEO_TS/VTS_02_0.VOB at 0x000037b1
    libdvdread: Elapsed time 0
    libdvdread: Get key for /VIDEO_TS/VTS_02_1.VOB at 0x00007e72
    libdvdread: Elapsed time 0
    libdvdread: Get key for /VIDEO_TS/VTS_03_0.VOB at 0x00030830
    libdvdread: Elapsed time 0
    libdvdread: Get key for /VIDEO_TS/VTS_03_1.VOB at 0x000359be
    libdvdread: Elapsed time 0
    libdvdread: Found 3 VTS's
    libdvdread: Elapsed time 0
    STAT: [1] VOB 2, Cell 1 (96%)

    INFO: VTSM 1/3
    No VTS_TMAPT available - skipping.

I grab the latest source code dvdauthor-0.7.1.tar.gz and get a look.
the code exit in dvdunauthor.c, in void getVobs(dvd_reader_t *dvd, const 
ifo_handle_t *ifo, int titleset, int titlef)

         vobs = DVDOpenFile(dvd, titleset, titlef ? DVD_READ_TITLE_VOBS  
: DVD_READ_MENU_VOBS);
         if (vobs == NULL)
           {
           /* error message already output */
             exit(1);
           } /*if*/


when trying to getVobs()  for the 'ifo' which "ifoOpen(dvd, titleset)" 
trigger this "No VTS_TMAPT available" message.

Yet, if I change the "exit(1)" to a "return" in this previous getVobs(), 
I'm able to read all vobs of the DVD correctly.?
May be getVobs() is not enough tolerant for some errors ?

Regards,
Arnaud

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