#248 Add initial support for 'optional' queries (single statement only) #252
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This adds back support for
optional
statements in queries.See new optional query test namespace for examples.
Note that multi-statement optional queries are not yet supported (throws a 'not implemented yet' exception). See issue #251
In the prior version of Fluree, optional statements were always wrapped inside a vector, even if just one statement. In this version single optional statements can just be declared (but can still be wrapped inside of a vector if desired). So the following two statements are equivalent: