chore: adding a changeset for fix gt-256 (#218)

Author: alocay

.changesets/fix_locay_properties_empty_map.md

@@ -0,0 +1,4 @@
+### Setting input_schema properties to empty when operation has no args ([Issue #136](https://github.com/apollographql/apollo-mcp-server/issues/136)) ([PR #212](https://github.com/apollographql/apollo-mcp-server/pull/212))
+
+To support certain scenarios where a client fails on an omitted `properties` field within `input_schema`, setting the field to an empty map (`{}`) instead. While a missing `properties` field is allowed this will unblock
+certain users and allow them to use the MCP server.