Fix possible segfault and add message box when recent file could not be found
Fix possible segfault and add message box when recent file could not be found

jmarshallnz/gummi,jmarshallnz/gummi,tonyolag/gummi-vim,tonyolag/gummi-vim,jmarshallnz/gummi,tonyolag/gummi-vim,tonyolag/gummi-vim,jmarshallnz/gummi