Prevent crash

app/src/main/java/eu/faircode/email/Core.java

@@ -876,6 +876,7 @@ class Core {
                     Log.i("End sync folder");
                 }
 
+                if (!subscribed_only || subscribed) {
                     nameFolder.put(folder.name, folder);
                     String parentName = folder.getParentName(separator);
                     if (!parentFolders.containsKey(parentName))
@@ -883,6 +884,7 @@ class Core {
                     parentFolders.get(parentName).add(folder);
                 }
             }
+        }
 
         Log.i("Updating folder parents=" + parentFolders.size());
         for (String parentName : parentFolders.keySet()) {