Fix error on invalid author

poetry/packages/package.py

@@ -162,6 +162,9 @@ class Package(object):
 
         m = AUTHOR_REGEX.match(self._authors[0])
 
+        if m is None:
+            return {"name": None, "email": None}
+
         name = m.group("name")
         email = m.group("email")
 
@@ -173,6 +176,9 @@ class Package(object):
 
         m = AUTHOR_REGEX.match(self._maintainers[0])
 
+        if m is None:
+            return {"name": None, "email": None}
+
         name = m.group("name")
         email = m.group("email")
 

tests/packages/test_package.py

@@ -17,6 +17,10 @@ def test_package_authors():
     assert package.author_name == "John Doe"
     assert package.author_email is None
 
+    package.authors.insert(0, "<John Doe")
+    assert package.author_name is None
+    assert package.author_email is None
+
 
 @pytest.mark.parametrize("category", ["main", "dev"])
 def test_package_add_dependency_vcs_category(category):