A few methods in tui_data_window check whether the contents are empty;
but all the callers already check this, so these calls can be removed.
gdb/ChangeLog
2019-08-30 Tom Tromey <tom@tromey.com>
* tui/tui-regs.c (tui_data_window::last_regs_line_no)
(tui_data_window::display_registers_from)
(tui_data_window::display_reg_element_at_line)
(tui_data_window::display_registers_from_line): Remove checks of
"empty".
0670413d0e