Fail script in case of invalid token

scripts/inform_codeowners.sh

@@ -151,6 +151,14 @@ function generate_file_list() {
 
 function generate_comment() {
 
+  # Fail the test if token isn't valid
+  MRINFO=$(curl -s --request GET --header "PRIVATE-TOKEN: $COMMENT_TOKEN" "https://git.cbm.gsi.de/api/v4/projects/$CI_MERGE_REQUEST_PROJECT_ID/merge_requests/$CI_MERGE_REQUEST_IID")
+  MRINFO_1=$(echo $MRINFO | grep project_id)
+  if [[ -z $MRINFO_1 ]]; then
+    echo "Invalid token. Stop execution"
+    exit 1
+  fi
+
   # Get Information about the MR in JSON format
   # Check if the returned string contains the signature that the CodeOwners label is set
   # Only create GitLab comment if there is no comment yet (CodeOwners label not set)