SEARCH-1742 Check for float != null rather than empty.

It doesn't really make sense to check if a float is empty, although the TAS
library seems to allow checking if integers and longs are empty for some
reason.

e2e-test/src/test/java/org/alfresco/test/search/functional/searchServices/search/SearchTest.java

@@ -72,7 +72,7 @@ public class SearchTest extends AbstractSearchServicesE2ETest
         
         SearchNodeModel entity = nodes.getEntryByIndex(0);
         entity.assertThat().field("search").contains("score");
-        entity.getSearch().assertThat().field("score").isNotEmpty();
+        entity.getSearch().assertThat().field("score").isNotNull();
         Assert.assertEquals(entity.getName(),"pangram.txt");
     }