Fix escapeLiteral() so it properly returns empty string and null #48
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escapeLiteral("") should return "''"
and
escapeLiteral(null) should return "NULL"
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escapeLiteral("") should return "''"
and
escapeLiteral(null) should return "NULL"
If empty string is currently sent to escapeLiteral, empty string is returned. What should be returned is a string containing just an open and close single-quote (which the actual library will do)
If null is sent to the method, the string "NULL" should be returned.