Fixed typo. Tests runs successfully

src/main/java/org/gcube/informationsystem/resourceregistry/contexts/ContextUtility.java

@@ -156,7 +156,7 @@ public class ContextUtility {
 		try {
 			current =  (ODatabaseDocument) ODatabaseRecordThreadLocal.instance().get();
 		}catch (Exception e) {
-			// It is possible that there is non current ODatabaseDocument
+			// It is possible that there is no current ODatabaseDocument
 		}
 		return current;
 	}