Report what data is available when ModelInfo contains unexpected types

It seems that the data can cointain strings (see issue #62). Let's dump what
data we have available to be able to debug this.

tests/test_client.py

@@ -67,6 +67,10 @@ DATA = {
             'type': 'Bit'
         },
         'Unexpected': {'type': 'Unexpected'},
+        'String': {
+            'type': 'String',
+            'option': 'some string'
+        },
     },
     'Course': {
         "3": {
@@ -117,6 +121,15 @@ class ModelInfoTest(unittest.TestCase):
         self.assertEqual(expected, actual)
 
     def test_value_unsupported(self):
+        data = "{'type': 'Unexpected'}"
         with self.assertRaisesRegex(
-                ValueError, 'unsupported value type Unexpected'):
+                ValueError,
+                f"unsupported value type 'Unexpected' data: '{data}'"):
             self.model_info.value('Unexpected')
+
+    def test_value_unsupported_but_data_available(self):
+        data = "{'type': 'String', 'option': 'some string}'"
+        with self.assertRaises(
+                ValueError,
+                msg=f"unsupported value type 'String' data: '{data}"):
+            self.model_info.value('String')

wideq/client.py

@@ -340,7 +340,8 @@ class ModelInfo(object):
             ref = d['option'][0]
             return ReferenceValue(self.data[ref])
         else:
-            raise ValueError("unsupported value type {}".format(d['type']))
+            raise ValueError(
+                f"unsupported value type '{str(d['type'])}' data: '{str(d)}'")
 
     def default(self, name):
         """Get the default value, if it exists, for a given value.