Add missing test fixture

tests/fixtures/with_empty_repositories_key/README.rst

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+My Package
+==========

tests/fixtures/with_empty_repositories_key/poetry.toml

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+[virtualenvs]
+in-project = false
+create = false

tests/fixtures/with_empty_repositories_key/pyproject.toml

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+[tool.poetry]
+name = "empty-repositories"
+version = "1.2.3"
+description = "Some description."
+authors = [
+    "Sébastien Eustace <sebastien@eustace.io>"
+]
+license = "MIT"
+
+readme = "README.rst"
+
+homepage = "https://python-poetry.org"
+repository = ""
+documentation = "https://python-poetry.org/docs"
+
+keywords = ["packaging", "dependency", "poetry"]
+
+classifiers = [
+    "Topic :: Software Development :: Build Tools",
+    "Topic :: Software Development :: Libraries :: Python Modules"
+]
+
+# Requirements
+[tool.poetry.dependencies]
+python = "~2.7 || ^3.6"
+cleo = "^0.6"
+pendulum = { git = "https://github.com/sdispater/pendulum.git", branch = "2.0" }
+requests = { version = "^2.18", optional = true, extras=[ "security" ] }
+pathlib2 = { version = "^2.2", python = "~2.7" }
+
+orator = { version = "^0.9", optional = true }
+
+# File dependency
+demo = { path = "../distributions/demo-0.1.0-py2.py3-none-any.whl" }
+
+# Dir dependency with setup.py
+my-package = { path = "../project_with_setup/" }
+
+# Dir dependency with pyproject.toml
+simple-project = { path = "../simple_project/" }
+
+
+[tool.poetry.extras]
+db = [ "orator" ]
+
+[tool.poetry.dev-dependencies]
+pytest = "~3.4"
+
+
+[tool.poetry.scripts]
+my-script = "local_config:main"
+
+
+[tool.poetry.plugins."blogtool.parsers"]
+".rst" = "some_module::SomeClass"