pane: Treat empty relative path as if it was None

This is applicable when the file does not belong to any real worktree. We get relative path by trying to remove every available worktree path as prefix of the current file. And when we get to worktree this file "belongs" to we get an empty string.

With this change "Copy Relative Path" action will no longer be available for these kinds of files.

Author: Poldraunic

crates/workspace/src/pane.rs

@@ -2212,7 +2212,8 @@ impl Pane {
                             .read(cx)
                             .item_for_entry(entry, cx)
                             .and_then(|item| item.project_path(cx))
-                            .map(|project_path| project_path.path);
+                            .map(|project_path| project_path.path)
+                            .map_or(None, |path| if path.exists() { Some(path) } else { None });
 
                         let entry_id = entry.to_proto();
                         menu = menu