camera device executes empty setBlobVector during exposure when it is busy

[fscbr]

Hi,during the exposure of an camera there are setBlobVector executions without blob element

11:38:14.692583 indigo_control_panel: 16 ->
11:38:14.692583 indigo_control_panel: 16 -> _

When the exposure is completed a filled setBlobVector is executed:
11:38:16.371560 indigo_control_panel: 16 -> _
11:38:16.371691 indigo_control_panel: 16 ->
11:38:16.371691 indigo_control_panel: 16 ->

The empty blob vector leads in phd2 to errors an the camera device gets stops the exposure loop. I fixed it in phd2 by filtering 0 size blobs, but I guess its an issue on indigo side.

The indi spec expects one or more elements in the blob vector:
_Define a property that holds one or more Binary Large Objects, BLOBs.

_

The same behaviour was shown with an Altair AA269c camera

[fscbr]

attached the log extract[
issue_indigo_1247.txt
](url)