fix: optional return value for paginator state
`$state->getData()->getData('GridFieldPaginator')' (line 598) returns null by default.
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@ -587,7 +587,7 @@ class GridFieldDetailForm_ItemRequest extends RequestHandler
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/**
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* Get the current paginator state
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*/
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private function getGridFieldPaginatorState(): GridState_Data
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private function getGridFieldPaginatorState(): ?GridState_Data
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{
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$state = $this->getGridField()->getState(false);
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$gridStateStr = $this->getStateManager()->getStateFromRequest($this->gridField, $this->getRequest());
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