Almost certainly not. I was worried about this when DD started nursery and actually wrote on the form 'please don't leave DD to cry' and the key worker said that they would never do that anyway.
When she started they used to rock and cuddle her to sleep, now they push her backwards and forwards in her pushchair.
On a couple of occasions she has had cried whilst fighting sleep (as she sometimes does at home) and they have always let me know and she has never been left crying on her own.