NullPointerException in FbxMesh.applyCluster()

[stephengold]

Using the current "master" branch of JME, I was attempting to load a skinned FBX model without any animation tracks (T-pose only):

Jan 31, 2023 6:43:07 PM com.jme3.app.LegacyApplication handleError
SEVERE: Uncaught exception thrown in Thread[jME3 Main,5,main]
java.lang.NullPointerException: Cannot read the array length because "positionIndices" is null
	at com.jme3.scene.plugins.fbx.mesh.FbxMesh.applyCluster(FbxMesh.java:127)
	at com.jme3.scene.plugins.fbx.mesh.FbxMesh.toJmeObject(FbxMesh.java:212)
	at com.jme3.scene.plugins.fbx.mesh.FbxMesh.toJmeObject(FbxMesh.java:58)
	at com.jme3.scene.plugins.fbx.obj.FbxObject.getJmeObject(FbxObject.java:113)
	at com.jme3.scene.plugins.fbx.node.FbxNode.toJmeObject(FbxNode.java:399)
	at com.jme3.scene.plugins.fbx.node.FbxNode.toJmeObject(FbxNode.java:71)
	at com.jme3.scene.plugins.fbx.obj.FbxObject.getJmeObject(FbxObject.java:113)
	at com.jme3.scene.plugins.fbx.node.FbxNode.createScene(FbxNode.java:496)
	at com.jme3.scene.plugins.fbx.node.FbxNode.createScene(FbxNode.java:503)
	at com.jme3.scene.plugins.fbx.node.FbxNode.createScene(FbxNode.java:503)
	at com.jme3.scene.plugins.fbx.FbxLoader.constructSceneGraph(FbxLoader.java:412)
	at com.jme3.scene.plugins.fbx.FbxLoader.load(FbxLoader.java:124)
	at com.jme3.asset.DesktopAssetManager.loadLocatedAsset(DesktopAssetManager.java:272)
	at com.jme3.asset.DesktopAssetManager.loadAsset(DesktopAssetManager.java:388)
	at com.jme3.asset.DesktopAssetManager.loadModel(DesktopAssetManager.java:439)
	at com.jme3.asset.DesktopAssetManager.loadModel(DesktopAssetManager.java:444)
	at jme3test.helloworld.HelloJME3.loadModel(HelloJME3.java:90)
	at jme3test.helloworld.HelloJME3.simpleInitApp(HelloJME3.java:69)
	at com.jme3.app.SimpleApplication.initialize(SimpleApplication.java:240)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.initInThread(LwjglAbstractDisplay.java:139)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:221)
	at java.base/java.lang.Thread.run(Thread.java:833)

The file version was 7400 (FBX v7.4).
The FBX importer seems to assume that since the model is skinned, it must have animation tracks.