fix PHP 8 warnings (#18)

src/EventListener/NoPwChangePageWarning.php

@@ -43,7 +43,7 @@ final class NoPwChangePageWarning
         if ($this->configuration->hasConfiguration(FrontendUser::class)) {
             $configuration = $this->configuration->getConfiguration(FrontendUser::class);
 
-            if ($configuration['change_days'] ?? false) {
+            if ($configuration['change_days'] ?? null) {
                 $needsPwChangePage = true;
             }
         }

src/EventListener/PasswordChangeListener.php

@@ -61,7 +61,7 @@ final class PasswordChangeListener
 
         $configuration = $this->configuration->getConfiguration($userEntity);
 
-        $maxDays = $configuration['change_days'];
+        $maxDays = $configuration['change_days'] ?? null;
 
         if (!$maxDays) {
             return null;

src/EventListener/PasswordHistoryListener.php

@@ -59,7 +59,7 @@ final class PasswordHistoryListener
 
         $configuration = $this->configuration->getConfiguration(FrontendUser::class);
 
-        $historyLength = (int) $configuration['password_history'];
+        $historyLength = (int) ($configuration['password_history'] ?? null);
 
         if (0 === $historyLength) {
             return;
@@ -106,7 +106,7 @@ final class PasswordHistoryListener
         }
 
         $configuration = $this->configuration->getConfiguration(BackendUser::class);
-        $historyLength = (int) $configuration['password_history'];
+        $historyLength = (int) ($configuration['password_history'] ?? null);
 
         if (0 === $historyLength) {
             return $password;

src/Validation/Validator/HaveIBeenPwned.php

@@ -38,7 +38,7 @@ final class HaveIBeenPwned implements PasswordValidatorInterface
         }
 
         $configuration = $this->configuration->getConfiguration($context->getUserEntity());
-        $minDataBreaches = $configuration['haveibeenpwned'];
+        $minDataBreaches = $configuration['haveibeenpwned'] ?? null;
 
         if (!$minDataBreaches) {
             return true;

src/Validation/Validator/MaximumLength.php

@@ -34,7 +34,7 @@ final class MaximumLength implements PasswordValidatorInterface
         }
 
         $configuration = $this->configuration->getConfiguration($context->getUserEntity());
-        $maximumLength = $configuration['max_length'];
+        $maximumLength = $configuration['max_length'] ?? null;
 
         if (!$maximumLength) {
             return true;

src/Validation/Validator/MinimumLength.php

@@ -34,7 +34,7 @@ final class MinimumLength implements PasswordValidatorInterface
         }
 
         $configuration = $this->configuration->getConfiguration($context->getUserEntity());
-        $minimumLength = $configuration['min_length'];
+        $minimumLength = $configuration['min_length'] ?? null;
 
         if (!$minimumLength) {
             return true;

src/Validation/Validator/PasswordHistory.php

@@ -44,7 +44,7 @@ final class PasswordHistory implements PasswordValidatorInterface
         }
 
         $configuration = $this->configuration->getConfiguration($context->getUserEntity());
-        $historyLength = $configuration['password_history'];
+        $historyLength = $configuration['password_history'] ?? null;
 
         if (!$historyLength) {
             return true;

src/Validation/Validator/RequiredCharacters.php

@@ -35,7 +35,7 @@ final class RequiredCharacters implements PasswordValidatorInterface
         }
 
         $configuration = $this->configuration->getConfiguration($context->getUserEntity());
-        $require = $configuration['require'];
+        $require = $configuration['require'] ?? null;
 
         if (!$require) {
             return true;
@@ -59,7 +59,7 @@ final class RequiredCharacters implements PasswordValidatorInterface
             if ($actual < $minimum) {
                 if ('other' === $category) {
                     $errors[] = new PasswordValidatorException(
-                        sprintf($this->translate('required.other'), $minimum, $configuration['other_chars'])
+                        sprintf($this->translate('required.other'), $minimum, $configuration['other_chars'] ?? null)
                     );
                     continue;
                 }
@@ -69,7 +69,7 @@ final class RequiredCharacters implements PasswordValidatorInterface
         }
 
         if (\count($errors) > 1) {
-            throw new PasswordValidatorException(sprintf($this->translate('required.summary'), $require['uppercase'], $require['lowercase'], $require['numbers'], $require['other'], $configuration['other_chars']));
+            throw new PasswordValidatorException(sprintf($this->translate('required.summary'), $require['uppercase'] ?? null, $require['lowercase'] ?? null, $require['numbers'] ?? null, $require['other'] ?? null, $configuration['other_chars'] ?? null));
         }
 
         if (\count($errors) > 0) {
@@ -112,7 +112,7 @@ final class RequiredCharacters implements PasswordValidatorInterface
     private function getRequiredOtherCharactersForRegexp(ValidationContext $context): ?string
     {
         $config = $this->configuration->getConfiguration($context->getUserEntity());
-        $chars = $config['other_chars'];
+        $chars = $config['other_chars'] ?? null;
 
         if (!$chars) {
             return null;