Add check with blank text

isso/views/comments.py

@@ -109,7 +109,7 @@ class API(object):
             if not isinstance(comment.get(key), (str, type(None))):
                 return False, "%s must be a string or null" % key
 
-        if len(comment["text"]) < 3:
+        if len(comment["text"].rstrip()) < 3:
             return False, "text is too short (minimum length: 3)"
 
         if len(comment.get("email") or "") > 254:

specs/test_comments.py

@@ -102,6 +102,12 @@ class TestComments(unittest.TestCase):
         rv = loads(r.data)
         assert len(rv) == 20
 
+    def testCreateBlank(self):
+        rv = self.post('/new?uri=%2Fpath%2F', data=json.dumps({'text': ''}))
+        assert rv.status_code == 400
+        rv = self.post('/new?uri=%2Fpath%2F', data=json.dumps({'text': "\n\n\n"}))
+        assert rv.status_code == 400
+
     def testGetInvalid(self):
 
         assert self.get('/?uri=%2Fpath%2F&id=123').status_code == 404