fix: don't set "dependencies" as empty list for uv tomml if there is no dependencies in the raw toml file (#3378) (#3381)

Author: monchin

news/3378.bugfix.md

@@ -0,0 +1 @@
+Don't set "dependencies" as empty list for uv toml if there is no dependencies in the raw toml file.

src/pdm/formats/uv.py

@@ -48,7 +48,6 @@ def build_pyproject_toml(self) -> Path:
             )
 
         data.setdefault("project", {})["requires-python"] = self.requires_python
-        data.setdefault("project", {})["dependencies"] = []
         data.pop("dependency-groups", None)
         data.setdefault("project", {}).pop("optional-dependencies", None)
         sources = {}