[Fixed] Crash Wings3D when click or rename folder item.

[tkbd]

Wings3D crashed while treated for folder/item in Geometry Graph.
I don't know in detail what kind of condition it will occur because sometimes it happens
The error logs are here.
In either case, the Geometry Graph window closes unexpectedly.

When rename folder.

Code:

Dump written 2016-11-30_19-4
Version: 2.1.3
Window: <0.80.0>
Reason: {badmatch,false}

Short stack trace:
[]

Long stack trace:
[{wings_geom_win,'-update_folders/2-fun-1-',3,
                 [{file,"wings_geom_win.erl"},{line,641}]},
{wx,batch,1,[{file,"wx.erl"},{line,184}]},
{wings_geom_win,handle_cast,2,[{file,"wings_geom_win.erl"},{line,578}]},
{wx_object,handle_msg,5,[{file,"wx_object.erl"},{line,450}]},
{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]

When click folder item

Code:

Dump written 2016-11-30_19-47
Version: 2.1.3
Window: <0.83.0>
Reason: {badmatch,false}

Short stack trace:
[]

Long stack trace:
[{wings_geom_win,handle_event,2,[{file,"wings_geom_win.erl"},{line,476}]},
{wx_object,handle_msg,5,[{file,"wx_object.erl"},{line,450}]},
{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]

MacOSX 10.11.6
Wings3D 2.1.3