Vietnam, Cambodia and Laos are no longer fully colored in light blue, this is because French is not used there very much these days.
Mauritania, Morocco, Algeria and Tunisia have been colored light blue, because the French language is widely used. There are even more French speakers in those countries where French is the official language.
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The standard on Wikipedia's world maps is the existence of a border between Morocco and Western Sahara. This is in accordance with the internationally recognized Moroccan borders. Therefore, the fact that French is a widely used language in Morocco is insufficient reason in this case. Either way, the Western Sahara territory could be highlighted if there were more than 20% French speakers within it.