Cryptic error when have no access to blobs directory

[odiszapc]

I have blobs defined as follows:

{
        "backend_id": 2,
        "type": "blob",
        "group": 2,
        "history": "/srv/node/sdi1/history",
        "data": "/srv/node/sdi1/data/blob",
        "sync": "-1",
        "blob_flags": "129",
        "blob_size": "8G",
        "records_in_blob": "10000000",
        "iterate_thread_num": 8,
        "defrag_percentage": 5
},

There were no access granted by mistake to /srv/node for user under which elliptics runs. Elliptics says about that fact in it's own cryptic manner:

2017-03-12 09:32:56.616854 0000000000000000/10197/10193 ERROR: blob: no data file present. Exiting. backend_id': 1

I think it would be userful for Elliptics to check access right. Of course it's a minor issue, but I have spent 20min to understand what's happening.