Monary block query problem in trigger

[JelleAalbers]

From https://github.com/XENON1T/pax/blob/master/pax/plugins/io/MongoDB.py:

# Somehow monary's block query fails when we have multiple blocks,
# we need to take care of copying out the data ourselves, but even if I use .copy it doesn't seem to work
# Never mind, just make a big block