Fix HF corporate graph count parsing

scripts/hf_load_corporate_graph.sh

@@ -48,16 +48,19 @@ wait_for_virtuoso() {
 }
 
 graph_count() {
-  printf "select count(*) from DB.DBA.RDF_QUAD where G = iri_to_id('%s');\n" "${GRAPH_URI}" \
-    | "$ISQL_BIN" "$ISQL_PORT" "$DBA_USER" "$DBA_PASSWORD" 2>/dev/null \
-    | python3 - <<'PY'
+  local raw
+  raw="$(
+    printf "select count(*) from DB.DBA.RDF_QUAD where G = iri_to_id('%s');\n" "${GRAPH_URI}" \
+      | "$ISQL_BIN" "$ISQL_PORT" "$DBA_USER" "$DBA_PASSWORD" 2>/dev/null || true
+  )"
+  RAW_ISQL_OUTPUT="$raw" python3 -c '
+import os
 import re
-import sys
 
-text = sys.stdin.read()
-matches = re.findall(r'^\s*(\d+)\s*$', text, flags=re.MULTILINE)
+text = os.environ.get("RAW_ISQL_OUTPUT", "")
+matches = re.findall(r"^\s*(\d+)\s*$", text, flags=re.MULTILINE)
 print(matches[-1] if matches else "0")
-PY
+'
 }
 
 echo "Waiting for Virtuoso before loading corporate graph ..."