Tokenizer: fall back on the simple tokenizer when NLTK is not available
Tokenizer: fall back on the simple tokenizer when NLTK is not available

wetneb/dissemin,dissemin/dissemin,wetneb/dissemin,wetneb/dissemin,Lysxia/dissemin,dissemin/dissemin,wetneb/dissemin,Lysxia/dissemin,dissemin/dissemin,Lysxia/dissemin,dissemin/dissemin,dissemin/dissemin,Lysxia/dissemin