fix fk on windows-pebinary

stix2/datastore/relational_db/input_creation.py

@@ -89,7 +89,7 @@ def generate_insert_information(self, name, stix_object, data_sink=None, table_n
     input_statements = list()
     for ex_name, ex in stix_object["extensions"].items():
         # ignore new extensions - they have no properties
-        if ex.extension_type and not ex.extension_type.startswith("new"):
+        if ex.extension_type is None or not ex.extension_type.startswith("new"):
             if ex_name.startswith("extension-definition"):
                 ex_name = ex_name[0:30]
                 ex_name = ex_name.replace("extension-definition-", "ext_def")

stix2/datastore/relational_db/table_creation.py

@@ -72,7 +72,7 @@ def create_hashes_table(name, metadata, schema_name, table_name, key_type=Text,
     columns = list()
     # special case, perhaps because its a single embedded object with hashes, and not a list of embedded object
     # making the parent table's primary key does seem to worl
-    if table_name == "windows-pebinary-ext_WindowsPEOptionalHeaderType":
+    if False:  #  table_name == "windows-pebinary-ext_WindowsPEOptionalHeaderType":
         columns.append(
             Column(
                 "id",
@@ -737,7 +737,7 @@ def generate_object_table(
                         ondelete="CASCADE",
                     ),
                     # if it is a not list, then it is a single embedded object, and the primary key is unique
-                    # primary_key=not is_list
+                    primary_key=not is_list
                 )
         elif level > 0 and is_embedded_object:
             column = Column(