Fix display of images, that can't be thumbnailed

src/MxcImageProvider.cpp

@@ -136,10 +136,10 @@ MxcImageProvider::download(const QString &id,
         opts.method  = crop ? "crop" : "scale";
         http::client()->get_thumbnail(
           opts,
-          [fileInfo, requestedSize, radius, then, id](const std::string &res,
+          [fileInfo, requestedSize, radius, then, id, crop](const std::string &res,
                                                             mtx::http::RequestErr err) {
               if (err || res.empty()) {
-                  then(id, QSize(), {}, "");
+                  download(id, QSize(), then, crop, radius);
 
                   return;
               }