Merge branch 'main' into patch-1

Author: cclauss

src/validate_pyproject/project_metadata.schema.json

@@ -326,7 +326,11 @@
           "format": "idn-email",
           "description": "MUST be a valid email address"
         }
-      }
+      },
+      "anyOf": [
+        { "required": ["name"] },
+        { "required": ["email"] }
+      ]
     },
     "entry-point-group": {
       "$id": "#/definitions/entry-point-group",

tests/examples/simple/empty-author.toml

@@ -0,0 +1,4 @@
+[project]
+name = 'foo'
+version = '1.0'
+authors = []

tests/invalid-examples/pep621/missing-fields/empty-author.errors.txt

@@ -0,0 +1 @@
+`project.authors[0]` cannot be validated by any definition

tests/invalid-examples/pep621/missing-fields/empty-author.toml

@@ -0,0 +1,4 @@
+[project]
+name = 'foo'
+version = '1.0'
+authors = [{}]