[nostalgia/core/studio] Fix PaletteEditor to handle Palettes with 0 pages

src/nostalgia/modules/core/src/studio/paletteeditor/paletteeditor-imgui.cpp

@@ -154,6 +154,7 @@ void PaletteEditorImGui::drawColorsEditor() noexcept {
 		ImGui::TableSetupColumn("Blue", ImGuiTableColumnFlags_WidthFixed, 40);
 		ImGui::TableSetupColumn("Preview", ImGuiTableColumnFlags_NoHide);
 		ImGui::TableHeadersRow();
+		if (m_page < m_pal.pages.size()) {
 			for (auto i = 0u; auto const &c: m_pal.pages[m_page].colors) {
 				ig::IDStackItem const idStackItem(static_cast<int>(i));
 				ImGui::TableNextRow();
@@ -172,6 +173,7 @@ void PaletteEditorImGui::drawColorsEditor() noexcept {
 				++i;
 			}
 		}
+	}
 	ImGui::EndTable();
 	if (colorEditor) {
 		ImGui::SameLine();