No solder mask unless there is something on the layer

[pipe]

There is no solder mask visible in the 3D Viewer unless there is at least something removing parts of the mask. This can be seen if you do the following:

1) Open up pcbnew
2) Create a random outline in the Edge.Cuts layer
3) Draw some tracks in the F.Cu layer
4) Open up 3D Viewer

Since the board has an F.Mask layer, I expect the whole board to be covered with solder mask, but it doesn't show up.

Adding anything to the mask layer, for example custom text or a normal pad, enables the mask.

Application: pcbnew
Version: (2016-02-02 BZR 6535, Git 0ef1eee)-product debug build
wxWidgets: Version 3.0.2 (debug,wchar_t,compiler with C++ ABI 1009,GCC 5.3.1,wx containers,compatible with 2.8)
Platform: Linux 4.3.0-1-amd64 x86_64, 64 bit, Little endian, wxGTK
Boost version: 1.58.0
         USE_WX_GRAPHICS_CONTEXT=OFF
         USE_WX_OVERLAY=OFF
         KICAD_SCRIPTING=ON
         KICAD_SCRIPTING_MODULES=ON
         KICAD_SCRIPTING_WXPYTHON=ON
         USE_FP_LIB_TABLE=HARD_CODED_ON
         BUILD_GITHUB_PLUGIN=ON