add hasParam api that determines if a parameter has been defined #27
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Adds the ability to know if a parameter has been defined.
Before #22, an inconsistency between javadocs and actual implementations meant that
hasValuereturnsfalseif the parameter has not been defined, instead of throwing an exception like the javadocs state.Anyone that exploited that functionality before #22 will then lose that functionality so this PR gives that functionality in a different way.