Fix crash in headless mode (bevyengine#4476)

# Objective Fixes bevyengine#4440. ## Solution Check if `RenderDevice` exists and add CI validation.
aevyrie · Jun 7, 2022 · dbed482 · dbed482
1 parent f0e7b2a
commit dbed482
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diff --git a/.github/example-run/headless_defaults.ron b/.github/example-run/headless_defaults.ron
@@ -0,0 +1,3 @@
+(
+    exit_after: Some(100)
+)
diff --git a/crates/bevy_pbr/src/light.rs b/crates/bevy_pbr/src/light.rs
@@ -642,8 +642,13 @@ pub(crate) fn assign_lights_to_clusters(
     lights_query: Query<(Entity, &GlobalTransform, &PointLight, &Visibility)>,
     mut lights: Local<Vec<PointLightAssignmentData>>,
     mut max_point_lights_warning_emitted: Local<bool>,
-    render_device: Res<RenderDevice>,
+    render_device: Option<Res<RenderDevice>>,
 ) {
+    let render_device = match render_device {
+        Some(render_device) => render_device,
+        None => return,
+    };
+
     global_lights.entities.clear();
     lights.clear();
     // collect just the relevant light query data into a persisted vec to avoid reallocating each frame