lsp-rename': move user-error' into `interactive'

"rename is invalid here" makes no sense if `lsp-rename' is not called
interactively.

Author: nbfalcon

lsp-mode.el

@@ -5667,9 +5667,11 @@ renaming is supported but cannot be done at point."
 
 (defun lsp-rename (newname)
   "Rename the symbol (and all references to it) under point to NEWNAME."
-  (interactive (list (-when-let ((symbol . placeholder) (lsp--get-symbol-to-rename))
-                       (read-string (format "Rename %s to: " symbol) placeholder nil symbol))))
-  (unless newname (user-error "`lsp-rename' is invalid here"))
+  (interactive
+   (-if-let ((symbol . placeholder) (lsp--get-symbol-to-rename))
+       (list (read-string (format "Rename %s to: " symbol)
+                          placeholder nil symbol))
+     (user-error "`lsp-rename' is invalid here")))
   (when-let ((edits (lsp-request "textDocument/rename"
                                  `( :textDocument ,(lsp--text-document-identifier)
                                     :position ,(lsp--cur-position)