Add a setting for error message of LspHover

autoload/lsp/internal/document_hover/under_cursor.vim

@@ -81,11 +81,30 @@ function! lsp#internal#document_hover#under_cursor#getpreviewwinid() abort
     return v:null
 endfunction
 
+function s:check_hover_response_empty(response) abort
+    if !has_key(a:response, 'result')
+        return 1
+    endif
+
+    if empty(a:response['result'])
+        return 1
+    endif
+
+    if empty(a:response['result']['contents'])
+        return 1
+    endif
+
+    return 0
+endfunction
+
 function! s:show_hover(ui, server_name, request, response) abort
-    if !has_key(a:response, 'result') || empty(a:response['result']) || 
-        \ empty(a:response['result']['contents'])
-        call lsp#utils#error('No hover information found in server - ' . a:server_name)
-        return
+    if s:check_hover_response_empty(a:response)
+        if g:lsp_hover_echo_empty_message
+            call lsp#utils#error('No hover information found in server - ' . a:server_name)
+            return
+        else
+            return
+        endif
     endif
 
     echo ''

doc/vim-lsp.txt

@@ -84,6 +84,7 @@ CONTENTS                                                  *vim-lsp-contents*
       g:lsp_fold_enabled                    |g:lsp_fold_enabled|
       g:lsp_hover_conceal                   |g:lsp_hover_conceal|
       g:lsp_hover_ui                        |g:lsp_hover_ui|
+      g:lsp_hover_echo_empty_message	    |g:lsp_hover_echo_empty_message|
       g:lsp_ignorecase                      |g:lsp_ignorecase|
       g:lsp_log_file                        |g:lsp_log_file|
       g:lsp_log_verbose                     |g:lsp_log_verbose|
@@ -1080,6 +1081,18 @@ g:lsp_hover_ui                                                *g:lsp_hover_ui*
 	let g:lsp_hover_ui = 'float'
 	let g:lsp_hover_ui = 'preview'
 
+g:lsp_hover_echo_empty_message                                *g:lsp_hover_echo_empty_message*
+    Type: |Boolean|
+    Default: `1`
+
+    Determines whether or not to echo empty hover messages. Set to `1` to
+    enable.
+
+    Example: >
+	let g:lsp_hover_echo_empty_message = 1
+	let g:lsp_hover_echo_empty_message = 0
+
+
 g:lsp_ignorecase                                         *g:lsp_ignorecase*
     Type: |Boolean|
     Default: the value of 'ignorecase'

plugin/lsp.vim

@@ -69,6 +69,7 @@ let g:lsp_show_workspace_edits = get(g:, 'lsp_show_workspace_edits', 0)
 let g:lsp_fold_enabled = get(g:, 'lsp_fold_enabled', 1)
 let g:lsp_hover_conceal = get(g:, 'lsp_hover_conceal', 1)
 let g:lsp_hover_ui = get(g:, 'lsp_hover_ui', '')
+let g:lsp_hover_echo_empty_message = get(g:, 'lsp_hover_echo_empty_message', 1)
 let g:lsp_ignorecase = get(g:, 'lsp_ignorecase', &ignorecase)
 let g:lsp_semantic_enabled = get(g:, 'lsp_semantic_enabled', 0)
 let g:lsp_semantic_delay = get(g:, 'lsp_semantic_delay', 500)