LibGUI: Print error when failing to load thumbnail in FileSystemModel

If a thumbnail cannot load it's a good opportunity to print out the
error message.
On top of that, we still want to update m_thumbnail_progress so that
the progress bar doesn't get stuck instead of returning early from
the lambda.

1 files changed, 3 insertions, 2 deletions

diff --git a/Userland/Libraries/LibGUI/FileSystemModel.cpp b/Userland/Libraries/LibGUI/FileSystemModel.cpp
index e74f90bceb..89840db8b2 100644
--- a/Userland/Libraries/LibGUI/FileSystemModel.cpp
+++ b/Userland/Libraries/LibGUI/FileSystemModel.cpp
@@ -657,9 +657,10 @@ bool FileSystemModel::fetch_thumbnail_for(Node const& node)
         [this, path, weak_this](auto thumbnail_or_error) {
             if (thumbnail_or_error.is_error()) {
                 s_thumbnail_cache.set(path, nullptr);
-                return;
+                dbgln("Failed to load thumbnail for {}: {}", path, thumbnail_or_error.error());
+            } else {
+                s_thumbnail_cache.set(path, thumbnail_or_error.release_value());
             }
-            s_thumbnail_cache.set(path, thumbnail_or_error.release_value());
 
             // The model was destroyed, no need to update
             // progress or call any event handlers.