[gnome-builder] sourceview: protect against NULL completion

[Christian Hergert <chergert src gnome org>]

commit e6c597d9588a5db269d435d933b4b560e4b4f2cf
Author: Christian Hergert <chergert redhat com>
Date:   Tue Jun 26 14:49:32 2018 -0700

    sourceview: protect against NULL completion
    
    This can happen during destruction, for example.

 src/libide/sourceview/ide-source-view.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/src/libide/sourceview/ide-source-view.c b/src/libide/sourceview/ide-source-view.c
index d72e36cb2..6524e6414 100644
--- a/src/libide/sourceview/ide-source-view.c
+++ b/src/libide/sourceview/ide-source-view.c
@@ -321,7 +321,8 @@ block_interactive (IdeSourceView *self)
 
   g_assert (IDE_IS_SOURCE_VIEW (self));
 
-  ide_completion_block_interactive (priv->completion);
+  if (priv->completion)
+    ide_completion_block_interactive (priv->completion);
 }
 
 static void
@@ -331,7 +332,8 @@ unblock_interactive (IdeSourceView *self)
 
   g_assert (IDE_IS_SOURCE_VIEW (self));
 
-  ide_completion_unblock_interactive (priv->completion);
+  if (priv->completion != NULL)
+    ide_completion_unblock_interactive (priv->completion);
 }
 
 static void