add firehazard.c

components/fileserver/src/token_subs.c

@@ -166,11 +166,17 @@ esp_err_t tpl_kv_replacer(httpd_req_t *r, void *context, const char *token, tpl_
     struct tpl_kv_list *head = context;
     SLIST_FOREACH(entry, head, link) {
         if (0==strcmp(entry->key, token)) {
-            return httpd_resp_send_chunk_escaped(r,
-                entry->subst_heap ?
-                    entry->subst_heap :
-                    entry->subst,
-                -1, escape);
+            if (entry->subst_heap) {
+                if (entry->subst_heap[0]) {
+                    return httpd_resp_send_chunk_escaped(r, entry->subst_heap, -1, escape);
+                }
+            } else {
+                if (entry->subst[0]) {
+                    return httpd_resp_send_chunk_escaped(r, entry->subst, -1, escape);
+                }
+                return ESP_OK;
+            }
+            return ESP_OK;
         }
     }