do not fail if cannot get a token for a user in login w/ burnettk

spiffworkflow-backend/bin/login_with_users

@@ -28,7 +28,7 @@ REALM_NAME=${2-spiffworkflow}
 while read -r input_line; do
   if ! grep -qE '(^#|email)' <<<"$input_line" ; then
     username=$(awk -F '@' '{print $1}' <<<"$input_line")
-    access_token=$("${script_dir}/get_token" "$username" "$username" "$REALM_NAME")
+    access_token=$("${script_dir}/get_token" "$username" "$username" "$REALM_NAME" || echo '')
     if [[ -z "$access_token" || "$access_token" == "null" ]]; then
       >&2 echo "ERROR: failed to get access token for '$username'"
     else