Save uploaded data unchanged if Chub conversion fails for any reason

Avoid non-resolving promise in /characters/chats readline if chat file is empty

src/endpoints/characters.js

@@ -1027,6 +1027,12 @@ router.post('/chats', jsonParser, async function (request, response) {
                 const stats = fs.statSync(pathToFile);
                 const fileSizeInKB = `${(stats.size / 1024).toFixed(2)}kb`;
 
+                if (stats.size === 0) {
+                    console.log(`Found an empty chat file: ${pathToFile}`);
+                    res({});
+                    return;
+                }
+
                 const rl = readline.createInterface({
                     input: fileStream,
                     crlfDelay: Infinity,

src/endpoints/chats.js

@@ -435,7 +435,7 @@ router.post('/import', urlencodedParser, function (request, response) {
 
             // Do a tiny bit of work to import Chub Chat data
             // Processing the entire file is so fast that it's not worth checking if it's a Chub chat first
-            let flattenedChat;
+            let flattenedChat = data;
             try {
                 // flattening is unlikely to break, but it's not worth failing to
                 // import normal chats in an attempt to import a Chub chat