'Update test to work with both old and new Gaudi versions (as we are still...

'Update test to work with both old and new Gaudi versions (as we are still building against both).' (EventInfo-00-11-02-10)

	* Tagging EventInfo-00-11-02-10.
	* test/MergedEventInfo_test.cxx: Update to work with both old and
	new Gaudi versions (as we are still building against both).

Event/EventInfo/test/MergedEventInfo_test.cxx

@@ -15,7 +15,8 @@ using namespace std;
 int main() {
   cout << "*** MergedEventInfo_test starts ***" << endl;
   MergedEventInfo empty;
-  assert( static_cast<EventID::number_type>(-1) == empty.event_ID()->run_number() );
+  assert( static_cast<EventID::number_type>(-1) == empty.event_ID()->run_number() || // Gaudi 27
+          0 == empty.event_ID()->run_number()); // Gaudi 26
   EventInfo anInfo(new EventID(1, 23), new EventType(), new TriggerInfo());
 
   MergedEventInfo merged(anInfo, 3, 33);