Fixed code by recommendation

Author: anzin

app/code/Magento/CatalogImportExport/Test/Unit/Model/Import/Product/ValidatorTest.php

@@ -112,7 +112,7 @@ public function attributeValidationProvider()
             [
                 'any_behavior',
                 [],
-                ['product_type' => 'any', 'sku' => ''],
+                ['product_type' => 'any'],
                 false,
                 Product::COL_SKU
             ],

app/code/Magento/Customer/Test/Unit/Model/Metadata/Form/MultiselectTest.php

@@ -144,6 +144,7 @@ public function outputValueTextDataProvider()
     {
         return [
             'empty' => ['', ''],
+            'null' => [false, ''],
             'number' => [14, 'fourteen'],
             'string' => ['some key', 'some string'],
             'array' => [[14, 'some key'], 'fourteen, some string'],
@@ -174,7 +175,7 @@ public function outputValueJsonDataProvider()
     {
         return [
             'empty' => ['', ['']],
-            'null' => [null, ['']],
+            'null' => [false, ['']],
             'number' => [14, ['14']],
             'string' => ['some key', ['some key']],
             'array' => [[14, 'some key'], ['14', 'some key']],