fix(bundler): reject falsy non-mapping requires/provides in CatalogEntry.from_dict

CatalogEntry.from_dict used `data.get("requires") or {}` and
`data.get("provides") or {}`, so a FALSY non-mapping ([], '', 0, false) was
coerced to {} before the isinstance guard — a corrupt catalog entry passed
silently. Only a truthy non-mapping was rejected.

Handle None explicitly and reject every other non-mapping, mirroring the
merged manifest requires/provides/integration guards (#3629, #3661).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: jawwad-ali

src/specify_cli/bundler/models/catalog.py

@@ -152,14 +152,21 @@ def from_dict(cls, data: Any) -> "CatalogEntry":
         if not isinstance(data, dict):
             raise BundlerError("Each catalog entry must be a mapping.")
         entry_id = str(data.get("id", "")).strip()
-        requires = data.get("requires") or {}
-        if not isinstance(requires, dict):
+        # `or {}` would coerce a FALSY non-mapping (0, '', False, []) to {} before
+        # the isinstance guard, silently accepting a corrupt catalog entry; only
+        # an absent/None value means "not present".
+        requires = data.get("requires")
+        if requires is None:
+            requires = {}
+        elif not isinstance(requires, dict):
             raise BundlerError(
                 f"Catalog entry '{entry_id or '<unknown>'}': 'requires' must be a "
                 "mapping when present."
             )
-        provides_raw = data.get("provides") or {}
-        if not isinstance(provides_raw, dict):
+        provides_raw = data.get("provides")
+        if provides_raw is None:
+            provides_raw = {}
+        elif not isinstance(provides_raw, dict):
             raise BundlerError(
                 f"Catalog entry '{entry_id or '<unknown>'}': 'provides' must be a "
                 "mapping when present."

tests/contract/test_catalog_schema.py

@@ -207,3 +207,17 @@ def test_catalog_entry_rejects_non_mapping_provides():
     data["provides"] = "extensions"
     with pytest.raises(BundlerError, match="'provides' must be a mapping"):
         CatalogEntry.from_dict(data)
+
+
+@pytest.mark.parametrize("field", ["requires", "provides"])
+@pytest.mark.parametrize("bad", [[], "", 0, False])
+def test_catalog_entry_rejects_falsy_non_mapping(field, bad):
+    # `or {}` coerced a FALSY non-mapping ([], '', 0, False) to {} before the
+    # isinstance guard, silently accepting a corrupt entry; only absent/None
+    # means "not present". Mirrors the manifest requires/provides guard.
+    from specify_cli.bundler.models.catalog import CatalogEntry
+
+    data = catalog_entry_dict("demo")
+    data[field] = bad
+    with pytest.raises(BundlerError, match=f"'{field}' must be a mapping"):
+        CatalogEntry.from_dict(data)