Kotlin: Add List<T?>.requireNoNullsOrNull(): List<T>? utility

java/kotlin-extractor/src/main/kotlin/utils/List.kt

@@ -0,0 +1,13 @@
+package com.github.codeql
+
+/**
+ * Turns this list of nullable elements into a list of non-nullable
+ * elements if they are all non-null, or returns null otherwise.
+ */
+public fun <T : Any> List<T?>.requireNoNullsOrNull(): List<T>? {
+  try {
+      return this.requireNoNulls()
+  } catch (e: IllegalArgumentException) {
+      return null;
+  }
+}