fix(network): added early return for empty-db case: when there's no payload AND db_version == 0.

1. Added early return for empty-db case (lines 959–966): When there's no payload (blob == NULL || blob_size == 0) AND db_version == 0, skip the network call entirely and return { server_version: 0, local_version: 0, status: "synced" }. This avoids the 404 from the status endpoint when the server doesn't know the device yet.
2. Fixed condition from || to && (line 969): Changed blob != NULL || blob_size > 0 to blob != NULL && blob_size > 0 — both conditions must be true to confirm there's actual data to upload.

Author: andinux

src/network.c

@@ -956,8 +956,18 @@ int cloudsync_network_send_changes_internal (sqlite3_context *context, int argc,
         return rc;
     }
 
+    // Case 1: empty local db — no payload and no server state, skip network entirely
+    if ((blob == NULL || blob_size == 0) && db_version == 0) {
+        if (out) {
+            out->server_version = 0;
+            out->local_version = 0;
+            out->status = network_compute_status(0, 0, 0, 0);
+        }
+        return SQLITE_OK;
+    }
+
     NETWORK_RESULT res;
-    if (blob != NULL || blob_size > 0) {
+    if (blob != NULL && blob_size > 0) {
         // there is data to send
         res = network_receive_buffer(netdata, netdata->upload_endpoint, netdata->authentication, true, false, NULL, CLOUDSYNC_HEADER_SQLITECLOUD);
         if (res.code != CLOUDSYNC_NETWORK_BUFFER) {