[postr] Use get_iter_first instead of get_item_root

[Germán Poó Caamaño <gpoo src gnome org>]

commit bed32575ea57e9efcb8c3e80ac099e5aa1dc15b2
Author: Germán Poo-Caamaño <gpoo gnome org>
Date:   Tue Jul 8 16:52:26 2014 -0700

    Use get_iter_first instead of get_item_root
    
    Both of them did the same, but only get_iter_first is present in
    gtk3.

 src/SetCombo.py |    2 +-
 src/postr.py    |    5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/src/SetCombo.py b/src/SetCombo.py
index 82f9415..d4a0273 100644
--- a/src/SetCombo.py
+++ b/src/SetCombo.py
@@ -108,7 +108,7 @@ class SetCombo(Gtk.ComboBox):
     #   index of the iterator on export might no longer be valid
     #   when the upload set is imported.
     def get_iter_for_set(self, set_id):
-        iter = self.model.get_iter_root()
+        iter = self.model.get_iter_first()
         while iter:
             iter_set_id = self.model.get(iter, COL_SETID)
             if iter_set_id[0] == set_id:
diff --git a/src/postr.py b/src/postr.py
index 09daef2..5f71e96 100644
--- a/src/postr.py
+++ b/src/postr.py
@@ -1285,7 +1285,7 @@ class Postr(UniqueApp):
             if self.set_combo.new_photoset_name:
                 dest["new_photoset_name"] = self.set_combo.new_photoset_name
 
-            iter = self.model.get_iter_root()
+            iter = self.model.get_iter_first()
             while iter:
                 path = self.model.get_string_from_iter(iter)
                 dest[path] = self._marshal_row(path, iter)
@@ -1446,7 +1446,8 @@ class Postr(UniqueApp):
             if set_iter:
                 self._set_value_in_model(ImageStore.COL_SET, set_iter, [index])
 
-        self._set_value_in_model(ImageStore.COL_GROUPS, groups, [index])
+        if groups:
+            self._set_value_in_model(ImageStore.COL_GROUPS, groups, [index])
 
         if privacy_path:
             privacy_iter = self.privacy_combo.model.get_iter(privacy_path)