[gnome-builder] diagnostics: ensure we have an adapter before diagnosing

[Christian Hergert <chergert src gnome org>]

commit b57884807175120dceee06691753ecf2fad18496
Author: Christian Hergert <chergert redhat com>
Date:   Thu Oct 27 18:45:57 2016 -0700

    diagnostics: ensure we have an adapter before diagnosing
    
    If for some reason the adapter has been cleared, (such as releasing a
    buffer), we can't proceed on the diagnosis.

 libide/diagnostics/ide-diagnostics-manager.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libide/diagnostics/ide-diagnostics-manager.c b/libide/diagnostics/ide-diagnostics-manager.c
index dfc7b91..a068782 100644
--- a/libide/diagnostics/ide-diagnostics-manager.c
+++ b/libide/diagnostics/ide-diagnostics-manager.c
@@ -491,7 +491,7 @@ ide_diagnostics_manager_begin_diagnose (gpointer data)
     {
       IdeDiagnosticsGroup *group = value;
 
-      if (group->needs_diagnose)
+      if (group->needs_diagnose && group->adapter != NULL)
         ide_diagnostics_group_diagnose (group, self);
     }