Everything about that tutorial works as expected (i.e it connects to the indi server, the mount moves to Vega, etc) but it gets hung up on the following line:
I know it is taking the photo, as the KStars FITS Viewer opens up with the image capture from the CCD Simulator, but it seems that the python script isn't receiving notification that the blob is available.
May you try without running kstars at the same time ?
It seems the python client does not get the blob data (you may easily check that, there is a print in the newblob callback in the tutorial code).
If you see the print message, there may be something updated in the threading.Event python library which causes this issue.