Remove BotJoinGroupEvent.Invite.invitorName as not provided by the server

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/protocol/packet/chat/NewContact.kt

@@ -15,6 +15,7 @@ import kotlinx.io.core.ByteReadPacket
 import kotlinx.io.core.readBytes
 import net.mamoe.mirai.contact.Group
 import net.mamoe.mirai.event.events.*
+import net.mamoe.mirai.getGroupOrNull
 import net.mamoe.mirai.qqandroid.QQAndroidBot
 import net.mamoe.mirai.qqandroid.message.contextualBugReportException
 import net.mamoe.mirai.qqandroid.network.Packet
@@ -178,10 +179,10 @@ internal class NewContact {
                             val group = bot.getNewGroup(groupCode) ?: return null
                             val invitor = group[actionUin]
 
-                            BotJoinGroupEvent.Invite(reqUinNick, invitor)
+                            BotJoinGroupEvent.Invite(invitor)
                         }
                         5 -> {
-                            val group = bot.getGroup(groupCode)
+                            val group = bot.getGroupOrNull(groupCode) ?: return null
                             val operator = group[actionUin]
                             BotLeaveEvent.Kick(operator)
                         }

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/events/group.kt

@@ -114,10 +114,6 @@ sealed class BotJoinGroupEvent : GroupEvent, Packet, AbstractEvent() {
      */
     @MiraiExperimentalAPI
     data class Invite internal constructor(
-        /**
-         * 邀请人昵称 (可能为备注或群名片)
-         */
-        val invitorName: String,
         /**
          * 邀请人
          */
@@ -126,7 +122,7 @@ sealed class BotJoinGroupEvent : GroupEvent, Packet, AbstractEvent() {
         override val group: Group get() = invitor.group
 
         override fun toString(): String {
-            return "BotJoinGroupEvent.Invite(invitorName='$invitorName', invitor=$invitor)"
+            return "BotJoinGroupEvent.Invite(invitor=$invitor)"
         }
     }
 }