Addressing @squirrelo's comments

Author: josenavas

qiita_db/metadata_template/base_metadata_template.py

@@ -535,6 +535,7 @@ def _add_common_creation_steps_to_queue(cls, md_template, obj_id,
         queue_name : str
             The queue where the SQL statements will be added
         """
+        cls._check_subclass()
         # Get some useful information from the metadata template
         sample_ids = md_template.index.tolist()
         num_samples = len(sample_ids)

qiita_db/metadata_template/test/test_base_metadata_template.py

@@ -51,6 +51,13 @@ def test_table_name(self):
         with self.assertRaises(IncompetentQiitaDeveloperError):
             MetadataTemplate._table_name(self.study)
 
+    def test_add_common_creation_steps_to_queue(self):
+        """_add_common_creation_steps_to_queue raises an error from base class
+        """
+        with self.assertRaises(IncompetentQiitaDeveloperError):
+            MetadataTemplate._add_common_creation_steps_to_queue(
+                None, 1, None, "")
+
 
 @qiita_test_checker()
 class TestMetadataTemplateReadWrite(TestCase):