优化：发送通道企微应用消息增加限制：@all或指定成员（避免82001错误）

app/src/main/java/com/idormy/sms/forwarder/fragment/senders/WeworkAgentFragment.kt

@@ -251,6 +251,9 @@ class WeworkAgentFragment : BaseFragment<FragmentSendersWeworkAgentBinding?>(),
 
         val atAll = binding!!.sbAtAll.isChecked
         val toUser = binding!!.etToUser.text.toString().trim()
+        if (!atAll && TextUtils.isEmpty(toUser)) {
+            throw Exception(getString(R.string.invalid_at_mobiles))
+        }
 
         val proxyType: Proxy.Type = when (binding!!.rgProxyType.checkedRadioButtonId) {
             R.id.rb_proxyHttp -> Proxy.Type.HTTP

app/src/main/res/layout/fragment_senders_wework_agent.xml

@@ -149,8 +149,7 @@
                 style="@style/senderBarStyle"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"
-                android:orientation="vertical"
-                android:visibility="gone">
+                android:orientation="vertical">
 
                 <LinearLayout
                     android:layout_width="match_parent"