Check if browser is NULL in midori_view_get_tab_menu to prevent a crash. Fixes bug #1215652.
Check if browser is NULL in midori_view_get_tab_menu to prevent a crash. Fixes bug #1215652.

dokidokivisual/midori,dokidokivisual/midori,dokidokivisual/midori,dokidokivisual/midori,dokidokivisual/midori