code: public static void checkBothNotNull(Object object1, Object object2, String errorMsg) {
  		check(!(object1 == null && object2 == null), errorMsg);
  	}
docs: Checks that at least one of object1 or object2 is not null
  
  @param object1 any object
  @param object2 any object
  @param errorMsg error message
  @throws IllegalArgumentException if both object1 and object2 are null