Updates to prevent deepsource noise and fix a psalm error

classes/helpers/FrmAppHelper.php

@@ -1378,7 +1378,14 @@ public static function icon_by_class( $class, $atts = array() ) {
 		$icon_classes = array();
 		$is_font_icon = true;
 
-		foreach ( preg_split( '/\s+/', $class, -1, PREG_SPLIT_NO_EMPTY ) as $single_class ) {
+		$single_classes = preg_split( '/\s+/', $class, -1, PREG_SPLIT_NO_EMPTY );
+
+		if ( ! $single_classes ) {
+			// preg_split returns false if $class is not a string.
+			$single_classes = array();
+		}
+
+		foreach ( $single_classes as $single_class ) {
 			if ( 'frmfont' === $single_class || 'frm_icon_font' === $single_class ) {
 				$is_font_icon = false;
 				continue;

tests/phpunit/base/FrmAjaxUnitTest.php

@@ -10,6 +10,14 @@ class FrmAjaxUnitTest extends WP_Ajax_UnitTestCase {
 	protected $is_pro_active    = false;
 	protected $contact_form_key = 'contact-with-email';
 
+	/**
+	 * Narrows the inherited property to the Formidable factory so static analysis
+	 * can resolve $this->factory->form, ->field and ->entry.
+	 *
+	 * @var FrmUnitTestFactory
+	 */
+	protected $factory;
+
 	public static function wpSetUpBeforeClass( $factory ) {
 		$_POST = array();
 		FrmHooksController::trigger_load_hook( 'load_ajax_hooks' );

tests/phpunit/base/FrmUnitTest.php

@@ -22,6 +22,14 @@ class FrmUnitTest extends WP_UnitTestCase {
 
 	protected $is_pro_active = false;
 
+	/**
+	 * Narrows the inherited property to the Formidable factory so static analysis
+	 * can resolve $this->factory->form, ->field and ->entry.
+	 *
+	 * @var FrmUnitTestFactory
+	 */
+	protected $factory;
+
 	/**
 	 * @var FrmUnitTest
 	 */