[gnome-builder] code-index: short-circuit if context was lost

[Christian Hergert <chergert src gnome org>]

commit bc0f8ca9d5043d712f6e1f8effcab04a6de75293
Author: Christian Hergert <chergert redhat com>
Date:   Fri Jun 21 16:30:30 2019 -0700

    code-index: short-circuit if context was lost

 src/plugins/code-index/ide-code-index-symbol-resolver.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/plugins/code-index/ide-code-index-symbol-resolver.c 
b/src/plugins/code-index/ide-code-index-symbol-resolver.c
index 358aceca9..263db0a21 100644
--- a/src/plugins/code-index/ide-code-index-symbol-resolver.c
+++ b/src/plugins/code-index/ide-code-index-symbol-resolver.c
@@ -53,6 +53,9 @@ ide_code_index_symbol_resolver_lookup_cb (GObject      *object,
       return;
     }
 
+  if (ide_task_return_error_if_cancelled (task))
+    return;
+
   context = ide_object_get_context (IDE_OBJECT (self));
   g_assert (IDE_IS_CONTEXT (context));