Show an error pop-up when csv import screen fails to load

https://forums.ankiweb.net/t/windows-10-2-1-62-qt6-blank-import-window/30231

qt/aqt/mediasrv.py

@@ -516,9 +516,11 @@ def _extract_collection_post_request(path: str) -> DynamicRequest | NotFound:
                     response.headers["Content-Type"] = "application/binary"
                 else:
                     response = flask.make_response("", HTTPStatus.NO_CONTENT)
-            except:
+            except Exception as exc:
                 print(traceback.format_exc())
-                response = flask.make_response("", HTTPStatus.INTERNAL_SERVER_ERROR)
+                response = flask.make_response(
+                    str(exc), HTTPStatus.INTERNAL_SERVER_ERROR
+                )
             return response
 
         return wrapped

ts/import-csv/index.ts

@@ -5,6 +5,7 @@ import "./import-csv-base.scss";
 
 import { ModuleName, setupI18n } from "@tslib/i18n";
 import { checkNightMode } from "@tslib/nightmode";
+import type { ImportExport, Notetypes } from "@tslib/proto";
 import { Decks, decks as decksService, empty, notetypes as notetypeService } from "@tslib/proto";
 
 import ImportCsvPage from "./ImportCsvPage.svelte";
@@ -32,12 +33,21 @@ const i18n = setupI18n({
 
 export async function setupImportCsvPage(path: string): Promise<ImportCsvPage> {
     const gettingMetadata = getCsvMetadata(path);
-    const [notetypes, decks, metadata] = await Promise.all([
-        gettingNotetypes,
-        gettingDecks,
-        gettingMetadata,
-        i18n,
-    ]);
+
+    let notetypes: Notetypes.NotetypeNames;
+    let decks: Decks.DeckNames;
+    let metadata: ImportExport.CsvMetadata;
+    try {
+        [notetypes, decks, metadata] = await Promise.all([
+            gettingNotetypes,
+            gettingDecks,
+            gettingMetadata,
+            i18n,
+        ]);
+    } catch (err) {
+        alert(err);
+        throw (err);
+    }
 
     checkNightMode();
 

ts/lib/proto.ts

@@ -27,6 +27,8 @@ export { Cards, Collection, Decks, Generic, Notes };
 
 export const empty = Generic.Empty.create();
 
+export class InternalError extends Error {}
+
 async function serviceCallback(
     method: rpc.ServiceMethod<Message<any>, Message<any>>,
     requestData: Uint8Array,
@@ -45,6 +47,11 @@ async function serviceCallback(
             body: requestData,
         });
 
+        if (result.status == 500) {
+            callback(new InternalError(await result.text()), null);
+            return;
+        }
+
         const blob = await result.blob();
         const respBuf = await new Response(blob).arrayBuffer();
         const uint8Array = new Uint8Array(respBuf);