Catch ValueError and raise TableDoesNotExist for describe_table

Author: jmphilli

pynamodb/connection/base.py

@@ -582,11 +582,13 @@ def describe_table(self, table_name):
         """
         Performs the DescribeTable operation
         """
-        tbl = self.get_meta_table(table_name, refresh=True)
-        if tbl:
-            return tbl.data
-        else:
-            raise TableDoesNotExist(table_name)
+        try:
+            tbl = self.get_meta_table(table_name, refresh=True)
+            if tbl:
+                return tbl.data
+        except ValueError:
+            pass
+        raise TableDoesNotExist(table_name)
 
     def get_conditional_operator(self, operator):
         """

pynamodb/tests/test_base_connection.py

@@ -338,6 +338,12 @@ def test_describe_table(self):
                 conn = Connection(self.region)
                 conn.describe_table(self.test_table_name)
 
+        with self.assertRaises(TableDoesNotExist):
+            with patch(PATCH_METHOD) as req:
+                req.side_effect = ValueError()
+                conn = Connection(self.region)
+                conn.describe_table(self.test_table_name)
+
     def test_list_tables(self):
         """
         Connection.list_tables