Fixed no-help case in Config.help.

src/Config.py

@@ -153,7 +153,10 @@ class Config(callbacks.Privmsg):
         """
         name = privmsgs.getArgs(args)
         wrapper = getWrapper(name)
-        irc.reply(wrapper.help)
+        if wrapper.help:
+            irc.reply(wrapper.help)
+        else:
+            irc.error('%s has no help.' % name)
 
     def default(self, irc, msg, args):
         """<name>

test/test_Config.py

@@ -51,6 +51,10 @@ class ConfigTestCase(ChannelPluginTestCase):
         self.assertError('config help supybot.alsdkfj')
         self.assertNotError('config help supybot.replies.success')
 
+    def testHelpDoesNotAssertionError(self):
+        self.assertNotRegexp('config help supybot.commands.defaultPlugins.help',
+                             'AssertionError')
+
 
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