Check account type for sent folder warning

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

@@ -5204,8 +5204,9 @@ public class FragmentCompose extends FragmentBase {
                             if (draft.identity == null)
                                 throw new IllegalArgumentException(context.getString(R.string.title_from_missing));
 
+                            EntityAccount account = db.account().getAccount(draft.account);
                             EntityFolder sent = db.folder().getFolderByType(draft.account, EntityFolder.SENT);
-                            if (sent == null)
+                            if (account != null && account.protocol == EntityAccount.TYPE_IMAP && sent == null)
                                 args.putBoolean("sent_missing", true);
 
                             try {