优化

app/src/main/java/io/legado/app/service/HttpReadAloudService.kt

@@ -113,12 +113,10 @@ class HttpReadAloudService : BaseReadAloudService(),
                     }
                 } else if (hasSpeakCache(fileName)) { //缓存文件还在，可能还没下载完
                     return@forEachIndexed
-                } else { //没有下载并且没有缓存文件
+                } else if (speakText.isEmpty()) {
-                    if (speakText.isEmpty()) {
-                        ensureActive()
                     createSilentSound(fileName)
                     return@forEachIndexed
-                    }
+                } else {
                     try {
                         createSpeakCache(fileName)
                         val analyzeUrl = AnalyzeUrl(