Handle case when exclude urls are empty

ee/app/assets/javascripts/security_configuration/dast_site_profiles_form/components/dast_site_profile_form.vue

@@ -185,8 +185,10 @@ export default {
           ...(this.glFeatures.securityDastSiteProfilesAdditionalFields && {
             ...additionalFields,
             auth: serializeFormObject(this.authSection.fields),
+            ...(additionalFields.excludedUrls && {
               excludedUrls: this.parseExcludedUrls(this.form.fields.excludedUrls),
             }),
+          }),
         },
       };