Tests: added Python test with not iterable object.

test/python/close/wsgi.py

@@ -5,6 +5,7 @@ class application:
 
     def __iter__(self):
         self.start('200', [(('Content-Length', '0'))])
+        yield b''
 
     def close(self):
         self.environ['wsgi.errors'].write('Close called.')

test/python/close_error/wsgi.py

@@ -5,6 +5,7 @@ class application:
 
     def __iter__(self):
         self.start('200', [(('!', '0'))])
+        yield b''
 
     def close(self):
         self.environ['wsgi.errors'].write('Close called.')

test/python/not_iterable/wsgi.py

@@ -0,0 +1,7 @@
+class application:
+    def __init__(self, environ, start_response):
+        self.environ = environ
+        self.start = start_response
+
+    def __iter__(self):
+        self.start('200', [(('Content-Length', '0'))])