scandata: ensure that returned path is a string

derivermodule/scandata.py

@@ -18,7 +18,7 @@ def get_scandata_xml(identifier, source_file):
     * identifier (str): Identifier of the item
     * source_file (str): sourceFile to be operated on
 
-    Returns the path to the scandata (str).
+    Returns the path to the scandata (str) or None
     """
     item_dir = Path(PB_ITEM)
 
@@ -32,11 +32,11 @@ def get_scandata_xml(identifier, source_file):
             source_xml_path = Path(f'{source_file.rsplit("_", 1)[0]}_scandata.xml')
 
     if source_xml_path.exists():
-        return source_xml_path
+        return str(source_xml_path)
     elif identifier_xml_path.exists():
-        return identifier_xml_path
+        return str(identifier_xml_path)
     elif raw_xml_path.exists():
-        return raw_xml_path
+        return str(raw_xml_path)
     elif zip_path.exists():
         try:
             # XXX: We don't clean up the temporary directory when we're done,
@@ -50,7 +50,7 @@ def get_scandata_xml(identifier, source_file):
             logger.warning('Unable to extract scandata.xml from scandata.zip')
             logger.exception(e)
             return None
-        return xml_path
+        return str(xml_path)
 
     logger.warning(f'Unable to find scandata file')
     return None