Fix test testDeleteMultipleStatementsExceptionCauseOfMultipleStatements
Fix test testDeleteMultipleStatementsExceptionCauseOfMultipleStatements

The test assumes that the deleteMatchingStatements function wants
only one statement. So it tries to break it with passing two
statements and the query method let pass them.

But from now on we check if multiple statement were given. In
case they were, an exception will be thrown.

SaftIng/Saft,SaftIng/Saft