Destroying ParticleRenderer leads to TypeError: Cannot read property '_isTemplate' of null

[jtabibito]

Describe the bug Destroying ParticleRenderer leads to TypeError: Cannot read property '_isTemplate' of null，becase the entity had been set null before.

To Reproduce Steps to reproduce the behavior: `

const scene = engine.sceneManager.activeScene;
const renderer1 = scene.createRootEntity("Renderer").addComponent(ParticleRenderer);
const mesh = new ModelMesh(engine, "mesh");
renderer1.mesh = mesh;
renderer1.destroy();

`

Expected behavior A clear and concise description of what you expected to happen.

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context Add any other context about the problem here.