Fix the conditions by which we show the queueing message

for Matlab inputs

common/lib/capa/capa/inputtypes.py

@@ -655,11 +655,11 @@ class MatlabInput(CodeInput):
         # Check if problem has been queued
         self.queuename = 'matlab'
         self.queue_msg = ''
-        if 'queue_msg' in self.input_state and self.status in ['queued','incomplete', 'unsubmitted']:
+        if 'queue_msg' in self.input_state and self.status in ['queued', 'incomplete', 'unsubmitted']:
             self.queue_msg = self.input_state['queue_msg']
-        if 'queued' in self.input_state and self.input_state['queuestate'] is not None:
+        if 'queuestate' in self.input_state and self.input_state['queuestate'] == 'queued':
             self.status = 'queued'
-            self.queue_len = 1
+            self.queue_len = '1'
             self.msg = self.plot_submitted_msg
 
 

common/lib/capa/capa/tests/test_inputtypes.py

@@ -361,7 +361,6 @@ class MatlabTest(unittest.TestCase):
                  'feedback': {'message': '3'}, }
         elt = etree.fromstring(self.xml)
 
-        input_class = lookup_tag('matlabinput')
         the_input = self.input_class(test_system, elt, state)
         context = the_input._get_render_context()
 
@@ -388,7 +387,6 @@ class MatlabTest(unittest.TestCase):
                  }
         elt = etree.fromstring(self.xml)
 
-        input_class = lookup_tag('matlabinput')
         the_input = self.input_class(test_system, elt, state)
         context = the_input._get_render_context()
         expected = {'id': 'prob_1_2',