[anjuta] Avoid an endless loop when updating a project

[Sebastien Granjoux <sgranjoux src gnome org>]

commit a44ac464f65cfcf1cc0d4607dd56759c74968a41
Author: Sébastien Granjoux <seb sfo free fr>
Date:   Sun Aug 20 13:46:34 2017 +0200

    Avoid an endless loop when updating a project

 plugins/am-project/am-project.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/plugins/am-project/am-project.c b/plugins/am-project/am-project.c
index 47abaf7..582aae8 100644
--- a/plugins/am-project/am-project.c
+++ b/plugins/am-project/am-project.c
@@ -277,6 +277,12 @@ get_relative_path (GFile *parent, GFile *file)
 {
        gchar *relative;
 
+       if (file == NULL)
+       {
+               g_warning("get_relative_path for a NULL file");
+               return NULL;
+       }
+
        relative = g_file_get_relative_path (parent, file);
        if (relative == NULL)
        {