Fix requirements.txt export for git dependencies

[zyv]

After #2662 was merged, exporting requirements with git dependencies triggers an exception due to accessing the first element of an empty list:

[tool.poetry.dependencies]
foo = { git = "ssh://git@github.com/foo/bar.git", rev = "301c6cb9f06ab071da7cb942060c64bdf59cd40a" }

This commit adds an empty check to avoid the exception.

Pull Request Check List

Resolves: moneymeets/python-poetry-buildpack#13

[zyv]

Hey @abn, could you please be so kind to have a look? I understand that you were the last one to work on this piece of code. I'm not sure if my fix is any good, and maybe one needs to add a test to prevent this from breaking in the future? Sorry, but I can't help much beyond pointing the problem out due to my present workload...

[abn]

@zyv can you try with1.1.1 first please? There was already a fix related to this. I didn't check with vcs deps, so might still be broken. Will check when i get a chance.

[zyv]

@abn thanks for the quick reaction, but the problem is still present for me in 1.1.1.

[abn]

@zyv I am unable to reproduce this.

$ cat pyproject.toml 
[tool.poetry]
name = "foobar"
version = "0.1.0"
description = ""
authors = ["Your Name <your.name@example.com>"]

[tool.poetry.dependencies]
python = "^3.8"
sampleproject = {git = "https://github.com/pypa/sampleproject.git", rev = "52966defd6a61e97295b0bb82cd3474ac3e11c7a"}

[tool.poetry.dev-dependencies]

[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"
$ poetry@1.1.1 export -f requirements.txt --without-hashes
peppercorn==0.6
sampleproject @ git+https://github.com/pypa/sampleproject.git@52966defd6a61e97295b0bb82cd3474ac3e11c7a

[marns93]

@abn It seems to me, that the error occurs if there is a git dependency within the dependency.
I can reproduce the problem with the following pyproject.toml

[tool.poetry]
name = "foobar"
version = "0.1.0"
description = ""
authors = ["Your Name <your.name@example.com>"]

[tool.poetry.dependencies]
python = "3.8.3"
sampleproject-mm = { git = "ssh://git@github.com/moneymeets/sampleproject.git", rev = "83068b995c2f94b0d51333b932b1a939084e9ef7" }

[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"

[github-actions]

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