searchGroupMembers method Null safety

Future<V2TimValueCallback<V2GroupMemberInfoSearchResult>> searchGroupMembers(
  1. {required V2TimGroupMemberSearchParam param}
)

Search for group members

TODO There are differences between Android and ios, ios can return key:list according to the group name, but Android but the key is "" is empty, I set it as default parameter:

The SDK will search the specified group ID list locally. The group member information (business card, friend notes, nickname, userID) is included in all group members in the keyword list keywordList and returns a map of the group ID and group member list. The keyword list supports up to 5. 
web does not support searching

Implementation

Future<V2TimValueCallback<V2GroupMemberInfoSearchResult>> searchGroupMembers({
  required V2TimGroupMemberSearchParam param,
}) async {
  return ImFlutterPlatform.instance.searchGroupMembers(param: param);
}