move tunnel port cap check

Author: mikew

src/lua_files/lua/tunnel_ports.lua

@@ -1,9 +1,7 @@
 ---@param port string|integer
 function _G._nvrh.tunnel_port(port)
   for _, channel in ipairs(_G._nvrh.get_nvrh_channels()) do
-    if channel.client.methods['tunnel-port'] then
-      _G._nvrh._tunnel_port_with_channel(channel_id, port)
-    end
+    _G._nvrh._tunnel_port_with_channel(channel.id, port)
   end
 
   if not _G._nvrh.mapped_ports[port] then
@@ -14,7 +12,15 @@ end
 ---@param channel_id integer
 ---@param port string|integer
 function _G._nvrh._tunnel_port_with_channel(channel_id, port)
-  pcall(vim.rpcnotify, tonumber(channel_id), 'tunnel-port', { tostring(port) })
+  local channel = vim.api.nvim_get_chan_info(channel_id)
+  if channel.client ~= nil and channel.client.methods['tunnel-port'] then
+    pcall(
+      vim.rpcnotify,
+      tonumber(channel_id),
+      'tunnel-port',
+      { tostring(port) }
+    )
+  end
 end
 
 vim.api.nvim_create_user_command('NvrhTunnelPort', function(args)