Fix empty variable

scripts/podx-tools.sh

@@ -377,7 +377,7 @@ if cands:
 else:
     print('', end='')
 PY
-    <<<"$json")"
+    <<<"$json")" || id=""
     # Fallback: if the list contains exactly one KB, use its id
     if [ -z "$id" ]; then
       id="$(printf '%s' "$json" | python3 - <<'PY'
@@ -393,7 +393,7 @@ if isinstance(items, list) and len(items)==1:
 else:
     print('', end='')
 PY
-)"
+)" || id=""
     fi
     if [ -n "$id" ]; then
       echo "[owui] resolved id for \"$name\": $id"