loopcontrol outputs nan values

After a recent update of carpet, some of my par files produce output like this:

INFO (LoopControl): LoopControl statistics:
INFO (LoopControl):   Loops traversed:    4
INFO (LoopControl):   Setups encountered: 14
INFO (LoopControl):   Params explored:    14
INFO (LoopControl):    Unoptimized time would have been: -nan s
INFO (LoopControl):    Actual time spent:                -nan s   (-nan%)
INFO (LoopControl):    Ideal time could have been:       -nan s   (-nan%)

Although no problem for the run, the 'nan's should probably not be output in that way.

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