check if yml file from qms exists

.ci/generateIndex.py

 import os, re
 from os import path
+from os.path import exists
 from natsort import natsorted
 from pathlib import Path
 import yaml
@@ -341,8 +342,11 @@ for folder in cardDirs:
 
                                 # extract the title from the QMS metadata
                                 if "qms" in root:
-                                    title = save_tag(localroot, root, file[:-3] + ".yml", "title")
-                                    prepare_qms(localroot, root, file)
+                                    if exists(os.path.join(root, file[:-3] + ".yml")):
+                                        title = save_tag(localroot, root, file[:-3] + ".yml", "title")
+                                        prepare_qms(localroot, root, file)
+                                    else:
+                                        print("QMS document is not formatted properly.")
 
                                 # remove the previous header
                                 n = remove_header(localroot, root, file)