Fix IMap.getKey() to return None() when a non-existent key is checked #124
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… instead of throwing "Null check operator used on a null value".
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Using IMap.getKey() to check if a key exists should return None() if the key doesn't exist. Instead it was throwing "Null check operator used on a null value".
This fix basically copies the code from the value .get() method that does correctly return None()