Non-empty Linked Lists sometimes end up with null head

[VincentToups]

Hi paldepind,

Very occasionally, I am unable to reproduce the bug reliably, I end up with linked lists returned by getEntityCollection which have a null head, but non-zero elements. Iteration over these linked lists via forEachWithComps obviously produces no execution of the callback, but creating new entities does seem to correctly put them into the entity collection. Any ideas?

[paldepind]

I haven't forgot this! I'll take a look as a soon as get the time :)