* dired.c (Ffile_attributes): Return Qnil, if Fexpand_file_name
raises an error.
* net/tramp-adb.el (tramp-adb-handle-file-attributes):
* net/tramp-gvfs.el (tramp-gvfs-handle-file-attributes):
* net/tramp-sh.el (tramp-sh-handle-file-attributes): Return nil in
case of errors.

* net/tramp.el (tramp-error-with-buffer): Show connection buffer
only when message appeared in minibuffer.