Text JQL fields do not handle multiple QueryLiteral objects.

The text fields do not handle multiple "QueryLiteral" values being returned. It is possible for an Operand to return multiple values and not be a list. We should handle this like any other field. For example, summary ~ echo(a, c) should be translated into summary ~ a or summary ~ c like anything else. At the moment we simply ignore anything but the QueryLiteral and log a useless message.