Fix panic (#17055)

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

i18n/en.json

@@ -2518,6 +2518,10 @@
     "id": "api.team.invite_guests.channel_in_invalid_team.app_error",
     "translation": "The channels of the invite must be part of the team of the invite."
   },
+  {
+    "id": "api.team.invite_guests_to_channels.invalid_body.app_error",
+    "translation": "Invalid or missing request body."
+  },
   {
     "id": "api.team.invite_members.disabled.app_error",
     "translation": "Email invitations are disabled."