fix(obsidian-nvim): remove util.table_length (#1603)

Author: wert2all

lua/astrocommunity/note-taking/obsidian-nvim/init.lua

@@ -62,7 +62,7 @@ return {
         local out = { id = note.id, aliases = note.aliases, tags = note.tags }
         -- `note.metadata` contains any manually added fields in the frontmatter.
         -- So here we just make sure those fields are kept in the frontmatter.
-        if note.metadata ~= nil and require("obsidian").util.table_length(note.metadata) > 0 then
+        if note.metadata ~= nil and not vim.tbl_isempty(note.metadata) then
           for k, v in pairs(note.metadata) do
             out[k] = v
           end