Don't register /flow-example in multiplayer

example.lua

@@ -1,4 +1,4 @@
--- Debugging
+-- You can run /flow-example in singleplayer to open this form
 local gui = flow.widgets
 
 local elements = {"box", "label", "image", "field", "checkbox", "list"}

init.lua

@@ -969,8 +969,9 @@ function gui_mt.__newindex()
 end
 
 local modpath = minetest.get_modpath("flow")
-local example_form
-minetest.register_chatcommand("flow-example", {
+if minetest.is_singleplayer() then
+    local example_form
+    minetest.register_chatcommand("flow-example", {
         privs = {server = true},
         help = "Shows an example formspec",
         func = function(name)
@@ -980,12 +981,14 @@ minetest.register_chatcommand("flow-example", {
             end
             example_form:show(name)
         end,
-})
+    })
+end
 
 if DEBUG_MODE then
     local f, err = loadfile(modpath .. "/test-fs.lua")
-    if not f then
+    if f then
+        return f()
+    else
         minetest.log("error", "[flow] " .. tostring(err))
     end
-    return f()
 end