dialog_sim_settings: don't try to read current wxChoice selection if no choices.
Fixes https://gitlab.com/kicad/code/kicad/-/issues/7823
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@ -299,7 +299,8 @@ int DIALOG_SIM_SETTINGS::ShowModal()
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void DIALOG_SIM_SETTINGS::updateDCSources( wxChar aType, wxChoice* aSource )
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{
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wxString prevSelection = aSource->GetString( aSource->GetSelection() );
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wxString prevSelection = aSource->GetCount() ?
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aSource->GetString( aSource->GetSelection() ) : wxEmptyString;
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std::vector<wxString> sourcesList;
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bool enableSrcSelection = true;
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