优化

app/src/main/java/io/legado/app/help/storage/AppWebDav.kt

@@ -122,9 +122,12 @@ object AppWebDav {
     }
 
     suspend fun hasBackUp(): Boolean {
+        if (isOk) {
             val url = "${rootWebDavUrl}${backupFileName}"
             return WebDav(url).exists()
         }
+        return false
+    }
 
     suspend fun backUpWebDav(path: String) {
         try {
@@ -163,17 +166,16 @@ object AppWebDav {
     }
 
     fun uploadBookProgress(book: Book) {
+        if (!isOk) return
         if (!AppConfig.syncBookProgress) return
         if (!NetworkUtils.isAvailable()) return
         Coroutine.async {
             val bookProgress = BookProgress(book)
             val json = GSON.toJson(bookProgress)
             val url = getProgressUrl(book)
-            if (isOk) {
             WebDav(url).upload(json.toByteArray(), "application/json")
         }
     }
-    }
 
     private fun getProgressUrl(book: Book): String {
         return bookProgressUrl + book.name + "_" + book.author + ".json"
@@ -196,6 +198,7 @@ object AppWebDav {
     }
 
     suspend fun downloadAllBookProgress() {
+        if (!isOk) return
         appDb.bookDao.all.forEach { book ->
             getBookProgress(book)?.let { bookProgress ->
                 if (bookProgress.durChapterIndex > book.durChapterIndex ||