Search: Allow searchContainedSyntax to be defined by constructor

Search: Allow searchContainedSyntax to be defined by constructor

The SearchResultSet is returned where no query is performed because it
is known ahead of time that no result exists. In cases where that is
known due to the syntax of the query (e.g. the syntax requires
searching a category that does not exist) this searchContainedSyntax
method returns the wrong value. This patch makes it possible for the
instantiating code to properly set the return value of this method.

Change-Id: I7b7be24f5630a48d2a561e4fda9cec696a8cacf9