fix: Preserve Data when duplicating SNV Portlet - MEED-7687 - Meeds-i…

…o/MIPs#165 (#1188)

Prior to this change, when the SNV Portlet doesn't have been
initialized/displayed yet in a page, like the default Space Templates,
the 'data.init' preference isn't used to initialize the portlet yet and
thus when duplicating the page template, the 'data.init' has to be
reused instead of generated only when the CMS portlet is initialized.

notes-service/src/main/java/io/meeds/notes/plugin/layout/renderer/NoteSingleViewRenderPlugin.java

@@ -54,7 +54,13 @@ public String getPortletName() {
   public List<PortletInstancePreference> generatePreferences(Application application, Portlet preferences) {
     String settingName = getCmsSettingName(preferences);
     if (StringUtils.isBlank(settingName)) {
-      return Collections.emptyList();
+      if (preferences != null && preferences.getPreference(DATA_INIT_PREFERENCE_NAME) != null) {
+        return Collections.singletonList(new PortletInstancePreference(DATA_INIT_PREFERENCE_NAME,
+                                                                       preferences.getPreference(DATA_INIT_PREFERENCE_NAME)
+                                                                                  .getValue()));
+      } else {
+        return Collections.emptyList();
+      }
     }
     NotePageData notePageData = notePageViewService.getNotePageData(settingName);
     return Collections.singletonList(new PortletInstancePreference(DATA_INIT_PREFERENCE_NAME,