How to remove nulls from a list

If I have a list that is something like
1,2,,3,,,,4
How can I make it into a list that is 1,2,3,4

<cfset myList = "1,2,,3,,,,4" />
<cfset myList = arrayToList(listToArray(myList)) />
<cfoutput>#myList#</cfoutput>

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