Issue #3338973 by Lendude, cbfannin, ericdsd, marc.groth: Deprecated:...

Issue #3338973 by Lendude, cbfannin, ericdsd, marc.groth: Deprecated: preg_split(): Passing null in argument_validator

(cherry picked from commit c4bbc93c)

core/modules/views/src/Plugin/views/argument_validator/Entity.php

@@ -177,7 +177,7 @@ public function submitOptionsForm(&$form, FormStateInterface $form_state, &$opti
   public function validateArgument($argument) {
     $entity_type = $this->definition['entity_type'];
 
-    if ($this->multipleCapable && $this->options['multiple']) {
+    if ($this->multipleCapable && $this->options['multiple'] && isset($argument)) {
       // At this point only interested in individual IDs no matter what type,
       // just splitting by the allowed delimiters.
       $ids = array_filter(preg_split('/[,+ ]/', $argument));

core/modules/views/tests/src/Unit/Plugin/argument_validator/EntityTest.php

@@ -129,6 +129,7 @@ public function testValidateArgumentNoAccess() {
 
     $this->assertFalse($this->argumentValidator->validateArgument(3));
     $this->assertFalse($this->argumentValidator->validateArgument(''));
+    $this->assertFalse($this->argumentValidator->validateArgument(NULL));
 
     $this->assertTrue($this->argumentValidator->validateArgument(1));
     $this->assertTrue($this->argumentValidator->validateArgument(2));
@@ -249,6 +250,8 @@ public function testValidateArgumentMultiple() {
     $this->assertFalse($this->argumentValidator->validateArgument('1,2'));
     $this->assertFalse($this->argumentValidator->validateArgument('1+2'));
 
+    $this->assertFalse($this->argumentValidator->validateArgument(NULL));
+
     $options = [];
     $options['access'] = TRUE;
     $options['bundles'] = [];