## Summary
Fixes a bug when there are only comments in the dependencies section.
Basically, after one removes all dependencies, if there are remaining
comments then the value unwrapped here
c198e2233e/crates/uv-workspace/src/pyproject_mut.rs (L1309)
is never properly initialized.
It's initialized to `None`, here
c198e2233e/crates/uv-workspace/src/pyproject_mut.rs (L1256),
but doesn't get set to `Some(...)` until the first dependency here
c198e2233e/crates/uv-workspace/src/pyproject_mut.rs (L1276)
and since we remove them all... there are none.
## Test Plan
Manually induced bug with
```
[project]
name = "t1"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.11"
dependencies = [
"duct>=0.6.4",
"minilog>=2.3.1",
# comment
]
```
Then running
```
$ RUST_LOG=trace RUST_BACKTRACE=full uv remove duct minilog
DEBUG uv 0.5.8
DEBUG Found project root: `/home/bnorick/dev/workspace/t1`
DEBUG No workspace root found, using project root
thread 'main' panicked at crates/uv-workspace/src/pyproject_mut.rs:1294:73:
called `Option::unwrap()` on a `None` value
stack backtrace:
0: 0x5638d7bed6ba - <unknown>
1: 0x5638d783760b - <unknown>
2: 0x5638d7bae232 - <unknown>
3: 0x5638d7bf0f07 - <unknown>
4: 0x5638d7bf215c - <unknown>
5: 0x5638d7bf1972 - <unknown>
6: 0x5638d7bf1909 - <unknown>
7: 0x5638d7bf18f4 - <unknown>
8: 0x5638d75087d2 - <unknown>
9: 0x5638d750896b - <unknown>
10: 0x5638d7508d68 - <unknown>
11: 0x5638d8dcf1bb - <unknown>
12: 0x5638d76be271 - <unknown>
13: 0x5638d75ef1f9 - <unknown>
14: 0x5638d75fc3cd - <unknown>
15: 0x5638d772d9de - <unknown>
16: 0x5638d8476812 - <unknown>
17: 0x5638d83e1894 - <unknown>
18: 0x5638d84722d3 - <unknown>
19: 0x5638d83e1372 - <unknown>
20: 0x7f851cfc7d90 - <unknown>
21: 0x7f851cfc7e40 - __libc_start_main
22: 0x5638d758e992 - <unknown>
23: 0x0 - <unknown>
```
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