fixed sd read error

src/aircraft_details.cpp

@@ -66,7 +66,6 @@ namespace {
         HTTPClient http;
         http.setTimeout(timeoutMs);
         if (!http.begin(persistentClient, url)) return false;
-        http.setReuse(true);
         int code = http.GET();
         bool ok = (code == HTTP_CODE_OK);
         if (ok) outBody = http.getString();
@@ -77,6 +76,7 @@ namespace {
     bool loadFromSd(const char* hex, Info& out) {
         if (!SdStorage::isMounted()) return false;
         String path = String(Config::SD_DETAIL_CACHE_DIR) + "/" + hex + ".txt";
+        if (!SD.exists(path)) return false;
         File f = SD.open(path);
         if (!f) return false;
         char line[64];