[gnome-builder] prefs: fix warning when no git info is set

[Christian Hergert <chergert src gnome org>]

commit e8a717b36014630eb374d9861471c97b1d18ea7f
Author: Christian Hergert <chergert redhat com>
Date:   Thu May 5 11:42:48 2016 +0300

    prefs: fix warning when no git info is set
    
    Passing NULL for text results in a warning, best to just default to ""
    in that case to silence the warnings.

 plugins/git/ide-git-preferences-addin.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/plugins/git/ide-git-preferences-addin.c b/plugins/git/ide-git-preferences-addin.c
index 528cff8..018fe90 100644
--- a/plugins/git/ide-git-preferences-addin.c
+++ b/plugins/git/ide-git-preferences-addin.c
@@ -120,7 +120,7 @@ register_git (IdePreferences *preferences)
 
   author_text = read_config_string (config, "user.name", NULL);
   author = g_object_new (IDE_TYPE_PREFERENCES_ENTRY,
-                         "text", author_text,
+                         "text", author_text ?: "",
                          "title", "Author",
                          "visible", TRUE,
                          NULL);
@@ -132,7 +132,7 @@ register_git (IdePreferences *preferences)
 
   email_text = read_config_string (config, "user.email", NULL);
   email = g_object_new (IDE_TYPE_PREFERENCES_ENTRY,
-                         "text", email_text,
+                         "text", email_text ?: "",
                         "title", "Email",
                         "visible", TRUE,
                         NULL);