fix ARRPOP

Author: leibale

packages/json/lib/commands/ARRPOP.ts

@@ -14,4 +14,4 @@ export function transformArguments(key: string, path?: string, index?: number):
     return args;
 }
 
-export { transformRedisJsonNullArrayReply as transformReply } from '.';
+export { transformRedisJsonNullArrayNullReply as transformReply } from '.';

packages/json/lib/commands/index.ts

@@ -84,8 +84,9 @@ export function transformRedisJsonNullReply(json: string | null): RedisJSON | nu
     return transformRedisJsonReply(json);
 }
 
-
-export function transformRedisJsonNullArrayReply(jsons: Array<string | null>): Array<RedisJSON | null> {
+export function transformRedisJsonNullArrayNullReply(jsons: Array<string | null> | null): Array<RedisJSON | null> | null {
+    if (jsons === null) return null;
+    
     return jsons.map(transformRedisJsonNullReply);
 }