You can test it.
Usually an emulsion with only non-ionic surfactant+water+oil will separate in one day. Now add ha and see if it makes it more stable or not.
@Abdullah That would depend on the type of emulsifier, oils and ratios. Non-ionic surfactants are actually the best emulsifiers (and solubilizers) due to their better packing (no charge repulsion) which allows micelle formation at lower cmc values than ionics. Because of this, they help you get very stable emulsions of different type (including micro, nano, etc).
Also, you have them in a different arrays of ethoxylation, to meet every need.