[fixed] Saved Views window rmb click problem

[Fonte Boa]

Create any scene, open Window|Manage Saved Views,
use View|Saved Views|Save (or RMB click on Saved Views window|Save New...)
to save at least two views.

In Saved Views window, select two views (keeping Ctrl key hold):
then right click on selected views:

a wings_crash.dump is generated and Saved Views window closes.

-------------------------------------------------

Dump written 2016-11-15_9-18
Version: 2.1.3
Window: <0.381.0>
Reason: {case_clause,2}

Short stack trace:
[]

Long stack trace:
[{wpc_views_win,get_selection,1,
[{file,"c:/Users/familjen/src/wings/plugins_src/commands/wpc_views_win.erl"},
{line,306}]},
{wpc_views_win,invoke_menu,1,
[{file,"c:/Users/familjen/src/wings/plugins_src/commands/wpc_views_win.erl"},
{line,338}]},
{wpc_views_win,handle_event,2,
[{file,"c:/Users/familjen/src/wings/plugins_src/commands/wpc_views_win.erl"},
{line,219}]},
{wx_object,handle_msg,5,[{file,"wx_object.erl"},{line,450}]},
{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]