refactor: make if condition more strict

Author: kenjis

phpstan-baseline.php

@@ -1341,11 +1341,6 @@
 	'count' => 7,
 	'path' => __DIR__ . '/system/Database/Postgre/Builder.php',
 ];
-$ignoreErrors[] = [
-	'message' => '#^Only booleans are allowed in a negated boolean, array\\<int\\|string, array\\<int, int\\|string\\>\\|string\\> given\\.$#',
-	'count' => 1,
-	'path' => __DIR__ . '/system/Database/Postgre/Builder.php',
-];
 $ignoreErrors[] = [
 	'message' => '#^Return type \\(CodeIgniter\\\\Database\\\\BaseBuilder\\) of method CodeIgniter\\\\Database\\\\Postgre\\\\Builder\\:\\:join\\(\\) should be covariant with return type \\(\\$this\\(CodeIgniter\\\\Database\\\\BaseBuilder\\)\\) of method CodeIgniter\\\\Database\\\\BaseBuilder\\:\\:join\\(\\)$#',
 	'count' => 1,

system/Database/Postgre/Builder.php

@@ -146,7 +146,7 @@ public function replace(?array $set = null)
             $this->set($set);
         }
 
-        if (! $this->QBSet) {
+        if ($this->QBSet === []) {
             if ($this->db->DBDebug) {
                 throw new DatabaseException('You must use the "set" method to update an entry.');
             }