Various code cleanup.

app/Services/Internal/Support/AccountServiceTrait.php

@@ -155,9 +155,7 @@ trait AccountServiceTrait
     {
         $dbNote       = $account->notes()->first();
         if ('' === $note) {
-            if (null !== $dbNote) {
-                $dbNote->delete();
-            }
+            $dbNote?->delete();
 
             return true;
         }
@@ -342,7 +340,6 @@ trait AccountServiceTrait
     }
 
     /**
-     * @throws FireflyException
      */
     protected function getCurrency(int $currencyId, string $currencyCode): TransactionCurrency
     {
@@ -377,7 +374,7 @@ trait AccountServiceTrait
 
             throw new FireflyException('Amount for update liability credit/debit was unexpectedly 0.');
         }
-        // if direction is "debit" (i owe this debt), amount is negative.
+        // if direction is "debit" (I owe this debt), amount is negative.
         // which means the liability will have a negative balance which the user must fill.
         $openingBalance                              = app('steam')->negative($openingBalance);
 

app/Services/Internal/Support/BillServiceTrait.php

@@ -56,9 +56,7 @@ trait BillServiceTrait
     {
         if ('' === $note) {
             $dbNote = $bill->notes()->first();
-            if (null !== $dbNote) {
-                $dbNote->delete();
-            }
+            $dbNote?->delete();
 
             return true;
         }

app/Services/Internal/Support/JournalServiceTrait.php

@@ -39,6 +39,7 @@ use FireflyIII\Rules\UniqueIban;
 use FireflyIII\Support\NullArrayObject;
 use Illuminate\Support\Facades\Log;
 
+use Safe\Exceptions\JsonException;
 use function Safe\json_encode;
 
 /**
@@ -265,7 +266,13 @@ trait JournalServiceTrait
     }
 
     /**
+     * @param Account|null $account
+     * @param array        $data
+     * @param string       $preferredType
+     *
+     * @return Account|null
      * @throws FireflyException
+     * @throws JsonException
      */
     private function createAccount(?Account $account, array $data, string $preferredType): ?Account
     {

app/Services/Internal/Support/RecurringTransactionTrait.php

@@ -54,9 +54,7 @@ trait RecurringTransactionTrait
     {
         if ('' === $note) {
             $dbNote = $recurrence->notes()->first();
-            if (null !== $dbNote) {
-                $dbNote->delete();
-            }
+            $dbNote?->delete();
 
             return true;
         }