Hide 7925 (#8359)

# Description

Hides https://github.com/nushell/nushell/pull/7925 from config and
disables by default. Option is still present in config, just hidden.

# User-Facing Changes

Users can no longer find `table.show_empty` in config and it is set to
false by default.

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.

crates/nu-protocol/src/config.rs

@@ -107,7 +107,7 @@ impl Default for Config {
         Config {
             filesize_metric: false,
             table_mode: "rounded".into(),
-            table_show_empty: true,
+            table_show_empty: false,
             external_completer: None,
             use_ls_colors: true,
             color_config: HashMap::new(),

crates/nu-utils/src/sample_config/default_config.nu

@@ -187,7 +187,6 @@ let-env config = {
   table: {
     mode: rounded # basic, compact, compact_double, light, thin, with_love, rounded, reinforced, heavy, none, other
     index_mode: always # "always" show indexes, "never" show indexes, "auto" = show indexes when a table has "index" column
-    show_empty: true # show 'empty list' and 'empty record' placeholders for command output
     trim: {
       methodology: wrapping # wrapping or truncating
       wrapping_try_keep_words: true # A strategy used by the 'wrapping' methodology