Only define remainder when not empty

I had an issue using a post method on a /path/ since get_args will set
me up with a first empty argument of an empty string and eat my first
argument with it.

Change-Id: Ieb2f192127c1fca430f1376e5bdb2be863fe6920

pecan/core.py

@@ -344,7 +344,7 @@ class PecanBase(object):
             return unquote_plus(x) if isinstance(x, six.string_types) \
                 else x
 
-        remainder = [_decode(x) for x in remainder]
+        remainder = [_decode(x) for x in remainder if x]
 
         if im_self is not None:
             args.append(im_self)

pecan/tests/test_base.py

@@ -928,6 +928,11 @@ class TestControllerArguments(PecanTestCase):
         assert r.status_int == 200
         assert r.body == b_('eater: 9, None, day=12, month=1')
 
+    def test_post_empty_remainder_with_json_kwargs(self):
+        r = self.app_.post_json('/eater/9/', {'month': '1', 'day': '12'})
+        assert r.status_int == 200
+        assert r.body == b_('eater: 9, None, day=12, month=1')
+
     def test_post_remainder_with_json_kwargs(self):
         r = self.app_.post_json('/eater/9', {'month': '1', 'day': '12'})
         assert r.status_int == 200