Add values (if there're any) when initiating items from dicts
Add values (if there're any) when initiating items from dicts

https://github.com/scrapy/scrapy/issues/3804

pawelmhm/scrapy,finfish/scrapy,pablohoffman/scrapy,elacuesta/scrapy,finfish/scrapy,elacuesta/scrapy,pawelmhm/scrapy,scrapy/scrapy,starrify/scrapy,eLRuLL/scrapy,starrify/scrapy,wujuguang/scrapy,wujuguang/scrapy,eLRuLL/scrapy,dangra/scrapy,eLRuLL/scrapy,pawelmhm/scrapy,finfish/scrapy,starrify/scrapy,scrapy/scrapy,dangra/scrapy,wujuguang/scrapy,pablohoffman/scrapy,dangra/scrapy,pablohoffman/scrapy,elacuesta/scrapy,scrapy/scrapy