Remove the first empty line for uv tree --package foo

[j178]

Summary

When using uv tree --package foo, an extra empty line appears at the beginning, which seems unnecessary since uv tree without the package option doesn’t have this. It’s possible that the intention was to add separation between packages, i.e. the correct implementation shoule be:

if !std::mem::take(&mut first) {
    lines.push(String::new());
}

Even if corrected, this extra spacing might be redundant as uv tree doesn’t include these empty lines between packages by default.

$ uv init project
$ cd project
$ uv init foo
$ uv tree
Using CPython 3.12.5
Resolved 2 packages in 1ms
foo v0.1.0
project v0.1.0

$ uv tree --package project
Using CPython 3.12.5
Resolved 2 packages in 1ms

project v0.1.0

[charliermarsh]

Good catch. Seems fine to just remove it.