[gnome-builder/gnome-builder-3-18] python: don't loop forever in indenter prototype

[Christian Hergert <chergert src gnome org>]

commit 489598368cd514878d28466d480b8931e4e02f07
Author: Christian Hergert <christian hergert me>
Date:   Sat Oct 3 05:42:26 2015 -0700

    python: don't loop forever in indenter prototype

 plugins/python-pack/python_indenter.py |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/plugins/python-pack/python_indenter.py b/plugins/python-pack/python_indenter.py
index 1d1064e..b78166c 100644
--- a/plugins/python-pack/python_indenter.py
+++ b/plugins/python-pack/python_indenter.py
@@ -329,7 +329,8 @@ class Discoveries:
 
         iter.set_line_offset(0)
         while iter.compare(stop) < 0:
-            iter.forward_line()
+            if not iter.forward_line():
+                break
             forward_to_nonspace(iter)
             if iter.get_line_offset() < column:
                 self._mark_ranks_with_mask(Rank.IF | Rank.ELIF | Rank.ELSE)