[fixed] Develop Load Font Glyphs generates a dump

[Fonte Boa]

(wings 2.1.4.1, windows 7)

Just by chance (because i usually dont call any of those commands), if i call Develop menu command "Load Font Glyphs", Wings generates a wings_crash.dump.

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Dump written 2016-12-3_17-8
Version: 2.1.4.1
Window: geom
Reason: badarg

Short stack trace:
[]

Long stack trace:
[{ets,match_object,[system_font,'_'],[]},
{ets,tab2list,1,[{file,"ets.erl"},{line,710}]},
{wings_develop,command,2,
[{file,"c:/Users/familjen/src/wings/src/wings_develop.erl"},
{line,65}]},
{wings_develop,time_command,2,
[{file,"c:/Users/familjen/src/wings/src/wings_develop.erl"},
{line,79}]},
{wings,raw_command,4,
[{file,"c:/Users/familjen/src/wings/src/wings.erl"},{line,621}]},
{wings_wm,handle_event,3,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,952}]},
{wings_wm,send_event,2,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,918}]},
{wings_wm,do_dispatch,2,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,824}]},
{wings_wm,get_and_dispatch,0,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,646}]},
{wings,init,1,
[{file,"c:/Users/familjen/src/wings/src/wings.erl"},{line,147}]}]