Prevent a blurhash failure from breaking all metadata collection

lib/pleroma/upload/filter/analyze_metadata.ex

@@ -83,21 +83,23 @@ defp media_dimensions(file) do
   end
 
   defp vips_blurhash(image = %Vix.Vips.Image{}) do
-    {:ok, resized_image} = Operation.thumbnail_image(image, 100)
+    with {:ok, resized_image} <- Operation.thumbnail_image(image, 100),
-    {height, width} = {Image.height(resized_image), Image.width(resized_image)}
+         {height, width} <- {Image.height(resized_image), Image.width(resized_image)},
-    max = max(height, width)
+         max <- max(height, width),
-    {x, y} = {max(round(width * 5 / max), 1), max(round(height * 5 / max), 1)}
+         {x, y} <- {max(round(width * 5 / max), 1), max(round(height * 5 / max), 1)} do
+      {:ok, rgba} =
+        if Image.has_alpha?(resized_image) do
+          Image.to_list(resized_image)
+        else
+          Operation.bandjoin_const!(resized_image, [255])
+          |> Image.to_list()
+        end
 
-    {:ok, rgba} =
+      rgba = List.flatten(rgba)
-      if Image.has_alpha?(resized_image) do
-        Image.to_list(resized_image)
-      else
-        Operation.bandjoin_const!(resized_image, [255])
-        |> Image.to_list()
-      end
 
-    rgba = List.flatten(rgba)
+      Blurhash.encode(x, y, width, height, rgba)
-
+    else
-    Blurhash.encode(x, y, width, height, rgba)
+      _ -> nil
+    end
   end
 end