fixed bug "NPE if document exists with _id: null" https://softinstigate.atlassian.net/browse/RH-154
fixed bug "NPE if document exists with _id: null"
https://softinstigate.atlassian.net/browse/RH-154
SoftInstigate/restheart,SoftInstigate/restheart,SoftInstigate/restheart,SoftInstigate/restheart