Prevent exception

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

@@ -457,7 +457,8 @@ public class BoundaryCallbackMessages extends PagedList.BoundaryCallback<TupleMe
                                     rules, null);
                             found++;
                         }
-                        db.message().setMessageFound(message.account, message.thread);
+                        if (message != null)
+                            db.message().setMessageFound(message.account, message.thread);
                     } catch (MessageRemovedException ex) {
                         Log.w(browsable.name + " boundary server", ex);
                     } catch (FolderClosedException ex) {

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

@@ -1849,7 +1849,7 @@ class Core {
                                 istore, ifolder, (MimeMessage) isub[j],
                                 false, download,
                                 rules, state);
-                        ids[from + j] = message.id;
+                        ids[from + j] = (message == null ? null : message.id);
                     } catch (MessageRemovedException ex) {
                         Log.w(folder.name, ex);
                     } catch (FolderClosedException ex) {