Check sanitized ref names before deleting

ntd2d_action/variants.py

@@ -98,6 +98,14 @@ def stable_versions(self):
                 if not version.version.is_prerelease]
 
     def _calc_branches_and_versions(self):
+        def sanitize(refs):
+            """Replace slashes in ref names
+
+            In a PR, refs can be, e.g., `12/merge`,
+            which causes downstream grief.
+            """
+            return [ref.replace("/", "_") for ref in refs]
+
         gha_utils.start_group("VariantCollection._calc_branches_and_versions")
 
         names = [variant.name for variant in self.html_dir.glob("*")]
@@ -121,8 +129,8 @@ def _calc_branches_and_versions(self):
             if variant.name in ["latest", "stable"]:
                 continue
 
-            if (variant.name not in self.repo.refs
-                and variant.name not in self.repo.origin.refs):
+            if (variant.name not in sanitize(self.repo.refs)
+                and variant.name not in sanitize(self.repo.origin.refs)):
                 # This variant has been removed from the repository,
                 # so remove the corresponding docs
                 gha_utils.debug(f"Deleting")