Allow empty value in RadioButtonFormField

Author: Cyperghost

com.woltlab.wcf/templates/shared_radioButtonFormField.tpl

@@ -1,3 +1,16 @@
+{if !$field->isRequired()}
+	<label>
+		<input {*
+			*}type="radio" {*
+			*}name="{$field->getPrefixedId()}" {*
+			*}value="" {*
+			*}{if !$field->getFieldClasses()|empty} class="{implode from=$field->getFieldClasses() item='class' glue=' '}{$class}{/implode}"{/if}{*
+			*}{if $field->getValue() !== null && $field->getValue() == ''} checked{/if}{*
+			*}{if $field->isImmutable()} disabled{/if}{*
+			*}{foreach from=$field->getFieldAttributes() key='attributeName' item='attributeValue'} {$attributeName}="{$attributeValue}"{/foreach}{*
+		*}> {lang}wcf.global.noSelection{/lang}
+	</label>
+{/if}
 {foreach from=$field->getOptions() key=$__fieldValue item=__fieldLabel}
 	<label>
 		<input {*

wcfsetup/install/files/lib/system/form/builder/field/RadioButtonFormField.class.php

@@ -62,7 +62,7 @@ public function supportsNestedOptions()
      */
     public function validate()
     {
-        if (!isset($this->getOptions()[$this->getValue()])) {
+        if ($this->isRequired() && !isset($this->getOptions()[$this->getValue()])) {
             $this->addValidationError(new FormFieldValidationError(
                 'invalidValue',
                 'wcf.global.form.error.noValidSelection'