xverbs: Inkscape crashes when file for XFileOpen is not found

[Patrick Storz]

Currently Inkscape crashes if the file specified for the "XFileOpen" xverb can not be found.

stacktrace:

Thread 1 received signal SIGSEGV, Segmentation fault.
0x0000000001505a19 in Inkscape::CmdLineXAction::doItX(Inkscape::ActionContext const&) ()
   from E:\Temp\Inkscape\inkscape\trunk_msys2\build64\inkscape\libinkscape_base.dll
(gdb) bt
#0 0x0000000001505a19 in Inkscape::CmdLineXAction::doItX(Inkscape::ActionContext const&) ()
   from E:\Temp\Inkscape\inkscape\trunk_msys2\build64\inkscape\libinkscape_base.dll
#1 0x0000000001503bfb in Inkscape::CmdLineAction::idle() ()
   from E:\Temp\Inkscape\inkscape\trunk_msys2\build64\inkscape\libinkscape_base.dll
#2 0x0000000000166843 in ?? ()
   from E:\Temp\Inkscape\inkscape\trunk_msys2\build64\inkscape\libglibmm-2.4-1.dll
#3 0x00000000685f215e in ?? ()
   from E:\Temp\Inkscape\inkscape\trunk_msys2\build64\inkscape\libglib-2.0-0.dll
#4 0x00000000685f2488 in ?? ()
   from E:\Temp\Inkscape\inkscape\trunk_msys2\build64\inkscape\libglib-2.0-0.dll
#5 0x00000000685f28f3 in ?? ()
   from E:\Temp\Inkscape\inkscape\trunk_msys2\build64\inkscape\libglib-2.0-0.dll
#6 0x00000000665a98dd in ?? ()
   from E:\Temp\Inkscape\inkscape\trunk_msys2\build64\inkscape\libgtk-3-0.dll
#7 0x0000000000405d08 in sp_main_gui(int, char const**) ()
#8 0x000000000040de70 in main ()

(on Windows 10 x64 with MSYS2 build of trunk r15698)

[Patrick Storz (ede123)]

Fix merged in
http://bazaar.launchpad.net/~inkscape.dev/inkscape/trunk/revision/15726