You'll only realise how important some things are only when they're gone.It's been a while since Ma Ling luncheon meat was pulled out from supermarket shelves here in Singapore. It's seems like eternity for die-hard Ma Ling fans, whom most grew up eating the canned luncheon meat. Those who are used to munching slices of Ma Ling in their Nasi Lemak or economical beehoon are …