[11.x] Fix validation attributes when translations are empty or missing (#51890)

* Check custom attributes array is set

* Add test for when translated validation attributes are missing

* Skip translated attributes if not set or empty

* StyleCI fixes

Author: owenandrews

src/Illuminate/Validation/Concerns/FormatsMessages.php

@@ -305,9 +305,11 @@ public function getDisplayableAttribute($attribute)
      */
     protected function getAttributeFromTranslations($name)
     {
-        return $this->getAttributeFromLocalArray(
-            $name, Arr::dot((array) $this->translator->get('validation.attributes'))
-        );
+        if (! is_array($attributes = $this->translator->get('validation.attributes'))) {
+            return null;
+        }
+
+        return $this->getAttributeFromLocalArray($name, Arr::dot($attributes));
     }
 
     /**

tests/Validation/ValidationValidatorTest.php

@@ -592,6 +592,20 @@ public function testTranslatedAttributeNamesAreReplacedInArraysFromNestedRules()
         $this->assertSame('User ID is required!', $v->messages()->first('users.0.id'));
     }
 
+    public function testTranslatedAttributesCanBeMissing()
+    {
+        $trans = $this->getIlluminateArrayTranslator();
+        $trans->addLines(['validation.gt.numeric' => ':attribute must be greater than :value.'], 'en');
+        $trans->addLines(['validation.attributes' => []], 'en');
+        $v = new Validator($trans, ['total' => 0], ['total' => 'gt:0']);
+        $this->assertSame('total must be greater than 0.', $v->messages()->first('total'));
+
+        $trans = $this->getIlluminateArrayTranslator();
+        $trans->addLines(['validation.gt.numeric' => ':attribute must be greater than :value.'], 'en');
+        $v = new Validator($trans, ['total' => 0], ['total' => 'gt:0']);
+        $this->assertSame('total must be greater than 0.', $v->messages()->first('total'));
+    }
+
     public function testInputIsReplaced()
     {
         $trans = $this->getIlluminateArrayTranslator();