[gnome-builder] ctags: break out early if context is unavailable

[Christian Hergert <chergert src gnome org>]

commit d785bff65bccdb896b8c64e88367ae40d95b76d7
Author: Christian Hergert <chergert redhat com>
Date:   Fri Jan 11 12:16:46 2019 -0800

    ctags: break out early if context is unavailable

 src/plugins/ctags/ide-ctags-builder.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/plugins/ctags/ide-ctags-builder.c b/src/plugins/ctags/ide-ctags-builder.c
index 14e8a104b..d298159b6 100644
--- a/src/plugins/ctags/ide-ctags-builder.c
+++ b/src/plugins/ctags/ide-ctags-builder.c
@@ -319,7 +319,8 @@ ide_ctags_builder_build_async (IdeTagsBuilder      *builder,
   ide_task_set_source_tag (task, ide_ctags_builder_build_async);
   ide_task_set_priority (task, G_PRIORITY_LOW + 200);
 
-  if (ide_object_in_destruction (IDE_OBJECT (self)))
+  if (ide_object_in_destruction (IDE_OBJECT (self)) ||
+      !(context = ide_object_get_context (IDE_OBJECT (self))))
     {
       ide_task_return_new_error (task,
                                  G_IO_ERROR,
@@ -342,7 +343,6 @@ ide_ctags_builder_build_async (IdeTagsBuilder      *builder,
    * reused even between configuration changes. Primarily, we want to avoid
    * putting things in the source tree.
    */
-  context = ide_object_get_context (IDE_OBJECT (self));
   workdir = ide_context_ref_workdir (context);
   relative_path = g_file_get_relative_path (workdir, directory_or_file);
   destination_path = ide_context_cache_filename (context, "ctags", relative_path, NULL);