Return NOT_A_PROBABILITY in getProbability for inalid dictionary.

static jint latinime_BinaryDictionary_getProbability(JNIEnv *env, jclass clazz, jlong dict,

        jintArray word) {

    Dictionary *dictionary = reinterpret_cast<Dictionary *>(dict);

    if (!dictionary) return 0;

    if (!dictionary) return NOT_A_PROBABILITY;

    const jsize wordLength = env->GetArrayLength(word);

    int codePoints[wordLength];

    env->GetIntArrayRegion(word, 0, wordLength, codePoints);