Fix of a tryo function

[lvitaly]

A current implementation of a tryo function has a few bugs. Basically, there are two cases when the function throws an exception instead of returning Failure. Here are these cases as a part of tests.

    "return Failure(_, Full(NPE), _) in case of non empty ignore list without NPE" in {
      val ignore: List[Class[_]] = List(classOf[IllegalArgumentException])

      Box.tryo(ignore)(throw new NullPointerException) must beLike {
        case Failure(_, Full(ex), _) => ex.getClass must_== classOf[NullPointerException]
      }
    }

    "not throw NPE in case of nullable ignore list" in {
      val ignore: List[Class[_]] = null

      Box.tryo(ignore)(throw new IllegalArgumentException) must beLike {
        case Failure(_, Full(ex), _) => ex.getClass must_== classOf[IllegalArgumentException]
      }
    }

The first one is about returning Failure with exception instead of throwing exception in case of exception is not in nonempty ignore list.
The second one is about throwing NPE in case of nullable ignore list. Basically, it is true for other parameters as well. For example for onError param. But I left existing condition for checking ignore list for null. Maybe is better to remove this condition at all or add the same checking to onError parameter.

[farmdawgnation]

Yep, that definitely looks like it was not intended behavior. Thanks for the fix! I'll let this mellow for a day or so to give other contributors an opportunity to weigh in, but I'm good.

[farmdawgnation]

Sorry for the delay here, I had a kid late last year and am just now getting back into the swing of OSS. I'm going to give this one final look and merge if it looks good.