Don't error if server replies with empty hover message

* eglot.el (eglot-eldoc-function): Check non-nil contents.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/74

diff --git a/lisp/progmodes/eglot.el b/lisp/progmodes/eglot.el
index 6f3676117a7153e335dbdc8eb9104b0b58a47a8d..3fd98c7d80093e422bca0900960d7a550d3b006c 100644 (file)
--- a/lisp/progmodes/eglot.el
+++ b/lisp/progmodes/eglot.el
@@ -1512,7 +1512,9 @@ If SKIP-SIGNATURE, don't try to send textDocument/signatureHelp."
          :success-fn (jsonrpc-lambda (&key contents range)
                        (unless sig-showing
                          (when-buffer-window
-                          (when-let (info (eglot--hover-info contents range))
+                          (when-let (info (and contents
+                                               (eglot--hover-info contents
+                                                                  range)))
                             (eldoc-message info)))))
          :deferred :textDocument/hover))
       (when (eglot--server-capable :documentHighlightProvider)