Take into account empty strings

- Add changelog

ee/app/assets/javascripts/security_dashboard/components/vulnerability_list.vue

@@ -102,7 +102,9 @@ export default {
       return Boolean(this.$listeners['sort-changed']);
     },
     hasAnyScannersOtherThanGitLab() {
-      return this.filteredVulnerabilities.some(v => v.scanner?.vendor !== 'GitLab');
+      return this.filteredVulnerabilities.some(
+        v => v.scanner?.vendor !== 'GitLab' && v.scanner?.vendor !== '',
+      );
     },
     notEnabledSecurityScanners() {
       const { available = [], enabled = [] } = this.securityScanners;

ee/changelogs/unreleased/267513-fix-vendor-name-check.yml

+---
+title: Fix GitLab vendor name appearing accidentally in the security reports when
+  it's the only one
+merge_request: 45442
+author:
+type: fixed

ee/spec/frontend/security_dashboard/components/vulnerability_list_spec.js

@@ -347,6 +347,25 @@ describe('Vulnerability list component', () => {
     });
   });
 
+  describe('when vendor name is not provided in the reports', () => {
+    let newVulnerabilities;
+
+    beforeEach(() => {
+      newVulnerabilities = generateVulnerabilities();
+      newVulnerabilities = newVulnerabilities.map(v => ({ ...v, scanner: { vendor: '' } }));
+      wrapper = createWrapper({
+        props: {
+          vulnerabilities: newVulnerabilities,
+          shouldShowReportType: true,
+        },
+      });
+    });
+
+    it('should not render the vendor name', () => {
+      expect(findVendorNames().exists()).toBe(false);
+    });
+  });
+
   describe('when there are other scanners in the report', () => {
     let newVulnerabilities;