previously empty content hash values couldn't be set when using a multicall because generateRecordCallArray() did a boolean check for the contentHash property existence, which excludes empty strings. changed check to be for typeof string, and added a default value of 0x in generateSingleRecordCall()
previously empty content hash values couldn't be set when using a multicall because
generateRecordCallArray()did a boolean check for the contentHash property existence, which excludes empty strings. changed check to be for typeof string, and added a default value of0xingenerateSingleRecordCall()