パラメータが空リストだった時に落ちる問題を修正

Author: k163377

src/main/kotlin/com/mapk/fastkfunction/FastKFunction.kt

@@ -132,7 +132,7 @@ sealed class FastKFunction<T> {
     companion object {
         @TestOnly
         internal fun List<KParameter>.checkParameters() = also {
-            val requireInstanceParameter = this[0].kind != KParameter.Kind.VALUE
+            val requireInstanceParameter = !isEmpty() && this[0].kind != KParameter.Kind.VALUE
 
             if (isEmpty() || (requireInstanceParameter && size == 1))
                 throw IllegalArgumentException("This function is not require arguments.")