Added test for Kotlin referring to null node.

Author: wolfmanstout

data/fixtures/recorded/languages/kotlin/changeValue13.yml

@@ -0,0 +1,31 @@
+languageId: kotlin
+command:
+  version: 7
+  spokenForm: change value
+  action:
+    name: clearAndSetSelection
+    target:
+      type: primitive
+      modifiers:
+        - type: containingScope
+          scopeType: {type: value}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: |-
+    fun main() {
+        val n = null
+        println(n)
+    }
+  selections:
+    - anchor: {line: 1, character: 8}
+      active: {line: 1, character: 8}
+  marks: {}
+finalState:
+  documentContents: |-
+    fun main() {
+        val n = 
+        println(n)
+    }
+  selections:
+    - anchor: {line: 1, character: 12}
+      active: {line: 1, character: 12}