Have a look at this thread: https://groups.google.com/forum/m/#!search/create$20missing$20tiddler/tiddlywiki/xo-kICZZEcg
The suggested solution was made by @BurningTreeC:
"Place the following at the bottom of the "save-tiddler-actions" macro in the $:/core/ui/EditTemplate Tiddler :
<$list filter="[all[current]links[]is[missing]]">
<$action-createtiddler $basetitle=<<currentTiddler>>/>
</$list>"
And @MarkS specifies where it should be put:
"At the top of $:/core/ui/EditTemplate there is a macro, "actions". Put the text at the bottom of the macro, just before "\end""
Best,
Anders