[TASK] Replaced all empty methods

Author: hojalatheef

Classes/Command/RemovePastPeriodsCommand.php

@@ -78,7 +78,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         $this->dataHandler->start([], $cmd);
         $this->dataHandler->process_cmdmap();
 
-        if (!empty($this->dataHandler->errorLog)) {
+        if ($this->dataHandler->errorLog !== []) {
             $output->writeln('Errors during DataHandler operations:');
             $output->writeln($this->dataHandler->errorLog);
             return 1;

Classes/Command/SendMailsCommand.php

@@ -154,7 +154,7 @@ protected function sendNextMail(): bool
 
     protected function getNextReceiver(): string
     {
-        if (empty($this->receivers)) {
+        if ($this->receivers === []) {
             if ($this->email instanceof Email) {
                 // all orders of current email are processed now
                 $this->unlockAndUpdateProcessedEmail();

Classes/DataHandler/AskForMailAfterPeriodUpdate.php

@@ -44,7 +44,7 @@ public function processDataHandlerResultAfterAllOperations(DataHandler $dataHand
         $this->dataHandler = $dataHandler;
         if (!Environment::isCli()) {
             $this->checkForUpdatedRecords();
-            if (!empty($this->updatedRecords) && $this->checkIfUpdatedRecordsAffectsOrders()) {
+            if (($this->updatedRecords !== []) && $this->checkIfUpdatedRecordsAffectsOrders()) {
                 $this->addJavaScriptAndSettingsToPageRenderer();
             }
         }

Classes/DataHandler/FacilityClearCacheAfterUpdate.php

@@ -41,7 +41,7 @@ public function processDataHandlerResultAfterAllOperations(DataHandler $dataHand
         // maybe split this big condition block into separated methods
         if (array_key_exists('tx_reserve_domain_model_facility', $dataHandler->datamap)) {
             foreach ($dataHandler->datamap['tx_reserve_domain_model_facility'] as $uid => $row) {
-                if (is_int($uid) && !empty($row['name'])) {
+                if (is_int($uid) && ($row['name'] !== '')) {
                     // only call this method if current facility isn't new, hidden or deleted!
                     $this->clearPageCacheAndAddFacilityName($uid);
                 }
@@ -92,7 +92,7 @@ public function processDataHandlerResultAfterAllOperations(DataHandler $dataHand
                 $this->clearPageCacheAndAddFacilityName((int)$row['uid']);
             }
         }
-        if (!empty($this->facilityNames)) {
+        if ($this->facilityNames !== []) {
             $flashMessageQueue = $this->getFlashMessageService()->getMessageQueueByIdentifier();
             $flashMessage = GeneralUtility::makeInstance(
                 FlashMessage::class,