OK, I did it like that:
*Tiddler A*: (field *relatedto*:"B")
Text A
*Tiddler B*: (tag: "C")
<$tiddler tiddler=<<currentTab>>>
<$list filter="[field:relatedto{!!title}]">
''<$transclude field="caption" />''
<$transclude />
</$list>
</$tiddler>
Text B
looks like:
Text A
Text B
*Tiddler C*:
<<tabs "[tag{!!title}field:relatedto[]] " "" "$:/state/tab2" "tc-vertical">>
Text C
**tag=C & field *relatedto* is empty
now looks like:
Text A
Text B
Text C
I took the answer from:
https://groups.google.com/forum/#!topic/Tiddlywiki/1H6yjmmLCCk
DONE
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