[gthumb: 2/4] image loader: return error if the image content is null

[Paolo Bacchilega <paobac src gnome org>]

commit 9648f6dc8f82f8d5f85b6e340cb5170713e28ffa
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Mon Aug 23 08:14:29 2021 +0200

    image loader: return error if the image content is null

 gthumb/gth-image-loader.c | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/gthumb/gth-image-loader.c b/gthumb/gth-image-loader.c
index 0564d651..dee2b5dd 100644
--- a/gthumb/gth-image-loader.c
+++ b/gthumb/gth-image-loader.c
@@ -260,6 +260,14 @@ load_image_thread (GTask        *task,
 
        _g_object_unref (istream);
 
+       if ((image != NULL) && gth_image_get_is_null (image)) {
+               _g_object_unref (image);
+               if (error == NULL)
+                       error = g_error_new_literal (G_IO_ERROR, G_IO_ERROR_FAILED, "Error");
+               g_task_return_error (task, error);
+               return;
+       }
+
        if ((image != NULL)
            && ! g_cancellable_is_cancelled (cancellable)
            && (self->priv->out_profile != NULL)