From my knowledge emotion lateralisation is still a theory.
But there are studies that apply this theory for their works: https://www.researchgate.net/publication/262288467_Detecting_emotion_from_EEG_signals_using_the_emotive_epoc_device
And there are also studies that indicate that affective (emotion) processing is different for left-handers: http://cogsci.stackexchange.com/questions/3305/eeg-correlates-of-handednesshttps://cogsci.stackexchange.com/questions/3305/eeg-correlates-of-handedness
In my own opininon I would say that emotion lateralisation is present, but not generic. But i am not an expert yet, just a both handed individual that has studied the effects of dominant hand change and how this affects human emotion.