Fix bug #1413192, fix seg fault in bsddb if a txn was deleted before the env.

Will backport.
diff --git a/Lib/test/test_bsddb3.py b/Lib/test/test_bsddb3.py
index cd6ccc6..34555ff 100644
--- a/Lib/test/test_bsddb3.py
+++ b/Lib/test/test_bsddb3.py
@@ -22,6 +22,12 @@
 
 
 def suite():
+    try:
+        # this is special, it used to segfault the interpreter
+        import bsddb.test.test_1413192
+    except:
+        pass
+
     test_modules = [
         'test_associate',
         'test_basics',