[dasher: 57/217] Fix a crash on startup on Gtk2

[Patrick Welche <pwelche src gnome org>]

commit 6bedda14585e404f59a3f833fc925e8b2ff25a2d
Author: Laetitia Baudoin <lbaudoin google com>
Date:   Tue Oct 13 05:14:19 2015 -0700

    Fix a crash on startup on Gtk2

 Src/Gtk2/dasher_editor.cpp |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/Src/Gtk2/dasher_editor.cpp b/Src/Gtk2/dasher_editor.cpp
index 9480bd1..9f53546 100644
--- a/Src/Gtk2/dasher_editor.cpp
+++ b/Src/Gtk2/dasher_editor.cpp
@@ -713,7 +713,10 @@ dasher_editor_get_filename(DasherEditor *pSelf) {
 const gchar *
 dasher_editor_get_all_text(DasherEditor *pSelf) {
   DasherEditorPrivate *pPrivate = DASHER_EDITOR_GET_PRIVATE(pSelf);
-
+  if (pPrivate == NULL) {
+    // This function can be called before pPrivate is set.
+    return "";
+  }
   GtkTextIter oStart;
   GtkTextIter oEnd;