Fix unicode error when trying to escape binary data

Author: dbowd

debug_toolbar/panels/sql/tracking.py

@@ -84,7 +84,10 @@ def __init__(self, cursor, db, logger):
 
     def _quote_expr(self, element):
         if isinstance(element, six.string_types):
-            return "'%s'" % force_text(element).replace("'", "''")
+            try:
+                return "'%s'" % force_text(element).replace("'", "''")
+            except DjangoUnicodeDecodeError:
+                return repr(element)
         else:
             return repr(element)