Fix for Github issue #979 : (#986)
Fix for Github issue #979 : (#986)

Issue: WMD Earth mover Distance for sentences that contain a single word return inf
Fix: Return float 0.0 when the dictionary size is 1 (both sentences are composed with the same token)
jaksmid/gensim,markroxor/gensim,piskvorky/gensim,RaRe-Technologies/gensim,isohyt/gensim,gojomo/gensim,summanlp/gensim,dsquareindia/gensim,olavurmortensen/gensim,markroxor/gensim,olavurmortensen/gensim,macks22/gensim,mattilyra/gensim,laic/gensim,robotcator/gensim,olavurmortensen/gensim,dsquareindia/gensim,gojomo/gensim,quole/gensim,macks22/gensim,markroxor/gensim,piskvorky/gensim,macks22/gensim,jaksmid/gensim,gojomo/gensim,loisaidasam/gensim,ELind77/gensim,quole/gensim,isohyt/gensim,gojomo/gensim,mattilyra/gensim,laic/gensim,loisaidasam/gensim,mattilyra/gensim,RaRe-Technologies/gensim,dsquareindia/gensim,akutuzov/gensim,robotcator/gensim,bhargavvader/gensim,loisaidasam/gensim,summanlp/gensim,RaRe-Technologies/gensim,ELind77/gensim,bhargavvader/gensim,Kreiswolke/gensim,isohyt/gensim,akutuzov/gensim,bhargavvader/gensim,ELind77/gensim,jaksmid/gensim,laic/gensim,summanlp/gensim,RaRe-Technologies/gensim,akutuzov/gensim,piskvorky/gensim,Kreiswolke/gensim,robotcator/gensim,Kreiswolke/gensim,quole/gensim