correct behaviour of win_iis when using site_id if site not found (#56567)

* Fixed #47057

* Fix trailing whitespace

* Change for review

changelogs/fragments/56567-Fix-win_iis_website-id assignment-for-first-new-site.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - "win_iis_website - site_id not used if no sites exist already and creating a new site (https://github.com/ansible/ansible/issues/47057)"

lib/ansible/modules/windows/win_iis_website.ps1

@@ -84,7 +84,13 @@ Try {
     # This is a bug in the New-WebSite commandlet. Apparently there must be at least one site configured in IIS otherwise New-WebSite crashes.
     # For more details, see http://stackoverflow.com/questions/3573889/ps-c-new-website-blah-throws-index-was-outside-the-bounds-of-the-array
     $sites_list = get-childitem -Path IIS:\sites
-    if ($null -eq $sites_list) { $site_parameters.ID = 1 }
+    if ($null -eq $sites_list) {
+      if ($site_id) {
+        $site_parameters.ID = $site_id
+      } else {
+        $site_parameters.ID = 1
+      }
+    }
 
     $site = New-Website @site_parameters -Force
     $result.changed = $true