Add a test case for a null user agent

Ref: phpmyadmin/phpmyadmin#20163

Author: williamdes

tests/Fixture/report_ua_null_js.json

@@ -0,0 +1,13 @@
+{
+    "pma_version": "5.2.4-dev",
+    "browser_name": "OTHER",
+    "browser_version": 0,
+    "user_os": "Other",
+    "server_software": "nginx/1.29.5",
+    "user_agent_string": null,
+    "locale": "en",
+    "configuration_storage": "enabled",
+    "php_version": "8.5.3",
+    "script_name": "index.php",
+    "exception_type": "js"
+}

tests/TestCase/Controller/IncidentsControllerTest.php

@@ -178,6 +178,32 @@ public function testCreateInvalidEmptyReport(): void
         $this->assertSame(false, $result['success']);
     }
 
+    public function testCreateIncidentFromBugReportUANull(): void
+    {
+        // Test invalid Notification email configuration
+        Configure::write('NotificationEmailsTo', '');
+
+        $bugReport = file_get_contents(TESTS . 'Fixture' . DS . 'report_ua_null_js.json');
+        $bugReportDecoded = json_decode($bugReport, true);
+        $this->configRequest(['input' => $bugReport]);
+        $this->post('/incidents/create');
+        $this->assertResponseCode(200);
+        $result = json_decode($this->_response->getBody(), true);
+        $this->assertNotNull($result);
+        $this->assertSame(true, $result['success']);
+
+        $report = $this->Reports->find(
+            'all',
+            order: ['Reports.created desc']
+        )->all()->first();
+        $subject = 'A new report has been submitted '
+            . 'on the Error Reporting Server: '
+            . $report['id'];
+        $this->assertEquals('5.2.4-dev', $report['pma_version']);
+
+        $this->assertNoMailSent();
+    }
+
     public function testCreateInvalidReport(): void
     {
         // Test invalid Notification email configuration

tests/TestCase/Model/Table/IncidentsTableTest.php

@@ -387,6 +387,15 @@ public function testGetClosestReport(): void
         $this->assertEquals($returnedReport, $result);
     }
 
+    public function testCreateIncidentFromBugReportUANull(): void
+    {
+        $bugReport = file_get_contents(TESTS . 'Fixture' . DS . 'report_ua_null_js.json');
+        $bugReport = json_decode($bugReport, true);
+
+        $result = $this->Incidents->createIncidentFromBugReport($bugReport);
+        $this->assertEquals(1, count($result['incidents']));
+    }
+
     public function testCreateIncidentFromBugReport(): void
     {
         $bugReport = file_get_contents(TESTS . 'Fixture' . DS . 'report_js.json');