MAINT: make sure domain var is set

src/caoscrawler/crawl.py

@@ -895,8 +895,8 @@ the CaosDB Crawler successfully crawled the data and
 
 """
 
-    if get_config_setting("create_crawler_status_records"):
     domain = get_config_setting("public_host_url")
+    if get_config_setting("create_crawler_status_records"):
         text += ("You can checkout the CrawlerRun Record for more information:\n"
                  f"{domain}/Entity/?P=0L10&query=find%20crawlerrun%20with%20run_id=%27{run_id}%27\n\n")
     text += (f"You can download the logfile here:\n{domain}/Shared/" + logfile)
@@ -1082,6 +1082,8 @@ def crawler_main(crawled_directory_path: str,
             ident = CaosDBIdentifiableAdapter()
             ident.load_from_yaml_definition(identifiables_definition_file)
             crawler.identifiableAdapter = ident
+        else:
+            raise ValueError("An identifiable file is needed.")
 
         remove_prefix = _treat_deprecated_prefix(prefix, remove_prefix)