[issue-680] debug writer: account for creation info being optional

Signed-off-by: Armin Tänzer <armin.taenzer@tngtech.com>

Author: armintaenzertng

src/spdx_tools/spdx3/writer/console/element_writer.py

@@ -15,7 +15,8 @@
 def write_element_properties(element: Element, text_output: TextIO):
     write_value("SPDXID", element.spdx_id, text_output)
     write_value("name", element.name, text_output)
-    write_creation_info(element.creation_info, text_output, True)
+    if element.creation_info:
+        write_creation_info(element.creation_info, text_output, True)
     write_value("summary", element.summary, text_output)
     write_value("description", element.description, text_output)
     write_value("comment", element.comment, text_output)