[meld] filediff: Add some paranoia in file saving

[Kai Willadsen <kaiw src gnome org>]

commit c4ecf33faa49010d142bf7e221560d2c199c00f7
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Mon Dec 29 09:14:04 2014 +1000

    filediff: Add some paranoia in file saving

 meld/filediff.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/meld/filediff.py b/meld/filediff.py
index 6a098ae..ee15840 100644
--- a/meld/filediff.py
+++ b/meld/filediff.py
@@ -1616,6 +1616,8 @@ class FileDiff(melddoc.MeldDoc, gnomeglade.Component):
 
     def _save_text_to_filename(self, filename, text):
         try:
+            if not isinstance(text, str):
+                raise IOError("couldn't encode text")
             open(filename, "wb").write(text)
         except IOError as err:
             misc.error_dialog(