[BUG] error occur, when `ecb-remote-path''s argument is nil.

When current buffer is *scratch* and M-x ecb-activate. Function
`ecb-remote-path' will get nil as its argument. Then `tramp-tramp-file-p' will
not get a string as its argument.

Here is the Backtrace

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  string-match("\\`/\\([^[/:]+\\|[^/]+]\\):" nil)
  tramp-tramp-file-p(nil)
  ecb-remote-path(nil)
  ecb-stealthy-vc-check--sources(restart)
  ecb-stealthy-vc-check-in-sources-buf()
  ecb-stealthy-updates(t)
  ecb-layout-window-sync()
  ecb-window-sync()
  ecb-activate--impl()
  ecb-activate-internal()
  ecb-minor-mode(1)
  ecb-activate()
  winring-set-name("ECB")
  (let ((name ...)) (if (string-equal name "") (setq name ...)) (winring-save-current-configuration) (delete-other-windows) (switch-to-buffer winring-new-config-buffer-name) (winring-set-name name))
  winring-new-configuration(nil)
  call-interactively(winring-new-configuration nil nil)


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