Fix warning from ./waf i18n about empty string
./waf i18n warns about passing an empty string to _(). Actually, the code in question just wants to make a label not appear, so it might as well just hide or show it as appropriate rather than attempting to set its text to the empty string.
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@ -555,10 +555,10 @@ EngineControl::enable_latency_tab ()
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lm_back_button_signal.disconnect();
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if (_measure_midi) {
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lm_back_button_signal = lm_back_button.signal_clicked().connect (sigc::bind (sigc::mem_fun (notebook, &Gtk::Notebook::set_current_page), midi_tab));
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lm_preamble.set_markup (_(""));
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lm_preamble.hide ();
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} else {
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lm_back_button_signal = lm_back_button.signal_clicked().connect (sigc::bind (sigc::mem_fun (notebook, &Gtk::Notebook::set_current_page), 0));
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lm_preamble.set_markup (_("<span weight=\"bold\">Turn down the volume on your audio equipment to a very low level.</span>"));
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lm_preamble.show ();
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}
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set_popdown_strings (lm_output_channel_combo, outputs);
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