Fix error when trying to clear non-existant component (#7215)

### What

* Fixes #7210

Changed the semantics of the method from "log empty" to "clear" which is
what we actually want in all cases. Being a clear, it's no longer an
error if there's nothing there to begin with as we don't have to write
anything then.

### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)
* [x] I have tested the web demo (if applicable):
* Using examples from latest `main` build:
[rerun.io/viewer](https://rerun.io/viewer/pr/7215?manifest_url=https://app.rerun.io/version/main/examples_manifest.json)
* Using full set of examples from `nightly` build:
[rerun.io/viewer](https://rerun.io/viewer/pr/7215?manifest_url=https://app.rerun.io/version/nightly/examples_manifest.json)
* [x] The PR title and labels are set such as to maximize their
usefulness for the next release's CHANGELOG
* [x] If applicable, add a new check to the [release
checklist](https://github.com/rerun-io/rerun/blob/main/tests/python/release_checklist)!
* [x] If have noted any breaking changes to the log API in
`CHANGELOG.md` and the migration guide

- [PR Build Summary](https://build.rerun.io/pr/7215)
- [Recent benchmark results](https://build.rerun.io/graphs/crates.html)
- [Wasm size tracking](https://build.rerun.io/graphs/sizes.html)

To run all checks from `main`, comment on the PR with `@rerun-bot
full-check`.

crates/viewer/re_selection_panel/src/defaults_ui.rs

@@ -146,7 +146,7 @@ fn active_default_ui(
                     re_ui::list_item::PropertyContent::new(component_name.short_name())
                         .min_desired_width(150.0)
                         .action_button(&re_ui::icons::CLOSE, || {
-                            ctx.save_empty_blueprint_component_by_name(
+                            ctx.clear_blueprint_component_by_name(
                                 &view.defaults_path,
                                 component_name,
                             );

crates/viewer/re_selection_panel/src/visualizer_ui.rs

@@ -435,7 +435,7 @@ fn editable_blueprint_component_list_item(
             .action_button(&re_ui::icons::CLOSE, || {
                 query_ctx
                     .viewer_ctx
-                    .save_empty_blueprint_component_by_name(blueprint_path, component);
+                    .clear_blueprint_component_by_name(blueprint_path, component);
             }),
     )
 }
@@ -457,7 +457,7 @@ fn menu_more(
         .on_disabled_hover_text("There's no override active")
         .clicked()
     {
-        ctx.save_empty_blueprint_component_by_name(override_path, component_name);
+        ctx.clear_blueprint_component_by_name(override_path, component_name);
         ui.close_menu();
     }
 

crates/viewer/re_space_view/src/view_property_ui.rs

@@ -218,7 +218,7 @@ This has the same effect as not setting the value in the blueprint at all."
         )
         .on_disabled_hover_text("The property is already unset.");
     if response.clicked() {
-        ctx.save_empty_blueprint_component_by_name(blueprint_path, component_name);
+        ctx.clear_blueprint_component_by_name(blueprint_path, component_name);
         ui.close_menu();
     }
 

crates/viewer/re_viewer_context/src/blueprint_helpers.rs

@@ -144,12 +144,12 @@ impl ViewerContext<'_> {
         {
             self.save_blueprint_array(entity_path, component_name, default_value);
         } else {
-            self.save_empty_blueprint_component_by_name(entity_path, component_name);
+            self.clear_blueprint_component_by_name(entity_path, component_name);
         }
     }
 
-    /// Helper to save a component to the blueprint store.
-    pub fn save_empty_blueprint_component_by_name(
+    /// Clears a component in the blueprint store by logging an empty array if it exists.
+    pub fn clear_blueprint_component_by_name(
         &self,
         entity_path: &EntityPath,
         component_name: ComponentName,
@@ -164,10 +164,7 @@ impl ViewerContext<'_> {
                     .map(|array| array.data_type().clone())
             })
         else {
-            re_log::error!(
-                "Tried to clear a component with unknown type: {}",
-                component_name
-            );
+            // There's no component at this path yet, so there's nothing to clear.
             return;
         };
 

crates/viewer/re_viewer_context/src/space_view/view_context.rs

@@ -151,14 +151,15 @@ impl<'a> ViewContext<'a> {
             .reset_blueprint_component_by_name(entity_path, component_name);
     }
 
+    /// Clears a component in the blueprint store by logging an empty array if it exists.
     #[inline]
-    pub fn save_empty_blueprint_component_by_name(
+    pub fn clear_blueprint_component_by_name(
         &self,
         entity_path: &EntityPath,
         component_name: ComponentName,
     ) {
         self.viewer_ctx
-            .save_empty_blueprint_component_by_name(entity_path, component_name);
+            .clear_blueprint_component_by_name(entity_path, component_name);
     }
 
     #[inline]

crates/viewer/re_viewport_blueprint/src/view_properties.rs

@@ -191,7 +191,7 @@ impl<'a> ViewProperty<'a> {
     /// Resets all components to empty values, i.e. the fallback.
     pub fn reset_all_components_to_empty(&self, ctx: &'a ViewerContext<'a>) {
         for &component_name in self.query_results.components.keys() {
-            ctx.save_empty_blueprint_component_by_name(&self.blueprint_store_path, component_name);
+            ctx.clear_blueprint_component_by_name(&self.blueprint_store_path, component_name);
         }
     }