Update follow_me.lua

1. Use `cache` class so now it generates memcache events.
2. Do not use nested if (simplify code)
3. Use local variables.
4. Remove redundant checks.

resources/install/scripts/resources/functions/channel_utils.lua

@@ -23,6 +23,14 @@ function channel_evalute(uuid, cmd)
 	return result
 end
 
+function channel_display(uuid, text)
+	local cmd = ("uuid_display %s '%s'"):format(uuid, text)
+	local result = trim(api:executeString(cmd))
+	if result:sub(1, 4) == '-ERR' then return nil, result end
+	if result == '_undef_' then return false end
+	return result
+end
+
 local _switchname
 local function switchname()
 	if _switchname then return _switchname end