Don't use the "exit_code" property value as the return value of js.exec() unless it's a number. As reported by mlong (thanks).
Also, "exit_code" was being set to null (instead of void/undefined) in js_PrepareToExecute(). I think this was just an oversight or typo by Deuce from his commit of 5 years ago (f3256d81). Since we're comparing exit_code with JSVAL_VOID in other places to determine if it was actually set, this appears to be a long standing bug.
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From Rob Swindell@VERT to Git commit to main/sbbs/master on Saturday, January 16, 2021 17:37:43