fix wiktionary no results error handling

modules/test/test_wiktionary.py

@@ -20,6 +20,12 @@ class TestWiktionary(unittest.TestCase):
         assert len(w[0]) > 0
         assert len(w[1]) > 0
 
+    def test_wiktionary_none(self):
+        w = wiktionary.wiktionary('Hell!')
+
+        assert len(w[0]) == 0
+        assert len(w[1]) == 0
+
     def test_w(self):
         input = Mock(group=lambda x: 'test')
         wiktionary.w(self.phenny, input)
@@ -27,3 +33,11 @@ class TestWiktionary(unittest.TestCase):
         out = self.phenny.say.call_args[0][0]
         m = re.match('^test — noun: .*$', out, flags=re.UNICODE)
         self.assertTrue(m)
+
+    def test_w_none(self):
+        word = 'Hell!'
+        input = Mock(group=lambda x: word)
+        wiktionary.w(self.phenny, input)
+
+        self.phenny.say.assert_called_once_with(
+                "Couldn't get any definitions for {0}.".format(word))

modules/wiktionary.py

@@ -38,7 +38,11 @@ def wiktionary(word):
     pages = json.loads(bytes)
     pages = pages['query']['pages']
     pg = next(iter(pages))
+
+    try:
         result = pages[pg]['revisions'][0]['*']
+    except KeyError:
+        return '', ''
 
     mode = None
     etymology = None