Seg. Fault in do_sort_ascending

When running swift, I get a segmentation fault in runner.c:255. I suppose it is due to the variable pivot being set to -NaN.

My IC is a Gadget simulation of a dwarf galaxy where I removed the stars and the DM (Thus a simulation of gas only).

I run swift with the following command and you can find my IC and output on https://obswww.unige.ch/~lhausamm/swift/issues/sort/ swift -s -t 1 params

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