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Set empty image in JavaScript

URL of experiment: https://run.pavlovia.org/Am8302/multipleoutcomes2/html/

Description of the problem: I am trying to set the value of an image to none. This works ok in builder/python but not in JS.

The python code is:
if stimA:
stimL = stimList[int(stimA)-1]
else:
stimL = None

if stimB:
stimR = stimList[int(stimB)-1]
else:
stimR = None

and the JS:

if (stimA!=undefined) {
stimL = stimList[(stimA)-1]
}
else {
stimL = None}

if (stimB!=undefined){
stimR = stimList[(stimB)-1]
}
else{
stimR = None}

I’m also having the issue that the experiment will currently only run on Chrome and freezes on Safari - not sure if this is related.

Thanks,
Alice