fix(dfx-openapi): Prevent orphan ampersands in query from empty arrays

Fixes applied from: openapi-ts/openapi-typescript#1936

Author: Dafnik

libs/dfx-openapi/src/lib/client.ts

@@ -368,6 +368,9 @@ export function createQuerySerializer<T = unknown>(options?: QuerySerializerOpti
           continue;
         }
         if (Array.isArray(value)) {
+          if (value.length === 0) {
+            continue;
+          }
           search.push(
             serializeArrayParam(name, value, {
               style: 'form',