Detection of unknown characters throws NullPointerException

[abdolence]

Thanks for a great work.
Bump into an issue with NPE.

Checked a problem with Unit Test:

import com.github.pemistahl.lingua.api.{Language, LanguageDetectorBuilder}
import org.scalatest._

class LanguageDetectTest extends FlatSpec with Matchers {

	val languageDetector = LanguageDetectorBuilder.
		fromLanguages(Language.ENGLISH,Language.GERMAN,Language.FRENCH).
		build()

	"A language detector" should "detect simple text" in {
		(languageDetector.detectLanguageOf("Hello").getIsoCode) should be("en")
	}

	it should "work without exception for weird texts and chars" in {
		noException shouldBe thrownBy {
			languageDetector.detectLanguageOf("""\_(ツ)_/¯""")
		}
	}
}

languageDetector.detectLanguageOf("""\_(ツ)_/¯""") - this is where NPE is occured.
This is a real text from user, actually :)

Callstack:

Caused by: kotlin.KotlinNullPointerException
	at com.github.pemistahl.lingua.api.LanguageDetector.getMostLikelyLanguage(LanguageDetector.kt:571)
	at com.github.pemistahl.lingua.api.LanguageDetector.detectLanguageOf(LanguageDetector.kt:88)

Thanks

[pemistahl]

Hi @abdmob, thank you for using my library and filing this bug report. I appreciate this a lot. 👍

You have found a serious bug, actually. Good catch! The NullPointerException is only thrown in those cases where the input string solely consists of letters that are unknown in any of the supported languages. I have just fixed this in release 0.3.2 with the commit 524e3eb. So please update.

I hope you still enjoy using my library. If you find any more issues, please do not hesitate to report them as well. Thank you and have a nice day.

[abdolence]

That was fast, cheers! :)

PS. This issue is an example why in Scala we have maxByOption now BTW ;) I hope in Kotlin you have it too.