fix(sphinx_ext): email is optional.

It's not obvious, but both name and email are optional for
authors.  NFC what one does with an author field lacking both,
but that's for the PEP authors to resolve.

We have authors in the pkgcore project that don't have email
listed, which now breaks html generation.  Thus this change.

The only hanky point here is that if it's just email, we output
that w/out the usual `<{email}>` brackets per standards.

Signed-off-by: Brian Harring <[email protected]>

src/snakeoil/dist/sphinxext.py

@@ -30,9 +30,19 @@ def prepare_scripts_man(repo_dir: Path, man_pages: list[tuple]):
     with open(repo_dir / 'pyproject.toml', 'rb') as file:
         pyproj = tomllib.load(file)
 
-    authors_list = [
-        f'{author["name"]} <{author["email"]}>' for author in pyproj['project']['authors']
-    ]
+    authors_list: list[str] = []
+    for author in pyproj['project']['authors']:
+        name, email = author.get('name'), author.get('email')
+        if name:
+            if email:
+                authors_list.append(f'{name} <{email}>')
+            else:
+                authors_list.append(name)
+        elif email:
+            authors_list.append(email)
+        else:
+            # no name or contact info, so ignore it.
+            continue
 
     for i, man_page in enumerate(man_pages):
         if man_page[3] is None: