add null return types
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@ -371,7 +371,7 @@ class Form extends ViewableData implements HasRequestHandler
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/**
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* Helper to get current request for this form
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*
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* @return HTTPRequest
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* @return HTTPRequest|null
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*/
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protected function getRequest()
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{
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@ -426,7 +426,7 @@ class Form extends ViewableData implements HasRequestHandler
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/**
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* Return any ValidationResult instance stored for this object
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*
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* @return ValidationResult The ValidationResult object stored in the session
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* @return ValidationResult|null The ValidationResult object stored in the session
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*/
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public function getSessionValidationResult()
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{
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@ -1612,7 +1612,7 @@ class Form extends ViewableData implements HasRequestHandler
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* Return the default button that should be clicked when another one isn't
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* available.
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*
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* @return FormAction
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* @return FormAction|null
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*/
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public function defaultAction()
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{
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