优化

app/src/main/java/io/legado/app/api/controller/BookController.kt

@@ -82,7 +82,7 @@ object BookController {
         this.bookUrl = bookUrl
         val bitmap = runBlocking {
             ImageProvider.cacheImage(book, src, bookSource)
-            ImageProvider.getImage(book, src, width)
+            ImageProvider.getImage(book, src, width)!!
         }
         return returnData.setData(bitmap)
     }