fix(studio): a card or thumbnail not drawn yet no longer prints "Error loading image"

src/crates/concat/src/host.rs

@@ -427,8 +427,14 @@ pub fn image_of(frame: &concat_core::frame::Frame) -> slint::Image {
     slint::Image::from_rgba8(buffer)
 }
 
-/// The JPEG at `path`, if it can be read, as a Slint image.
+/// The picture at `path`, if it can be read, as a Slint image. A file that
+/// is not there is `None` without a word: Slint prints every load that
+/// fails, and a cached picture not drawn yet is the expected case, not a
+/// fault.
 pub fn image_at(path: &std::path::Path) -> Option<slint::Image> {
+    if !path.is_file() {
+        return None;
+    }
     slint::Image::load_from_path(path).ok()
 }
 

src/crates/concat/src/studio.rs

@@ -1195,11 +1195,8 @@ fn package_art(
             package
                 .folder
                 .as_deref()
-                .and_then(|folder| slint::Image::load_from_path(&folder.join("preview.png")).ok())
-                .or_else(|| {
-                    let card = card_paths.get(id)?;
-                    slint::Image::load_from_path(card).ok()
-                })
+                .and_then(|folder| image_at(&folder.join("preview.png")))
+                .or_else(|| image_at(card_paths.get(id)?))
                 .or_else(|| bundled_card(id))
                 .unwrap_or_default()
         })