fix: add bounds checking to the selectedrow func (#351)

table/table.go

@@ -266,6 +266,10 @@ func (m *Model) UpdateViewport() {
 // SelectedRow returns the selected row.
 // You can cast it to your own implementation.
 func (m Model) SelectedRow() Row {
+	if m.cursor < 0 || m.cursor >= len(m.rows) {
+		return nil
+	}
+
 	return m.rows[m.cursor]
 }