only send device update info when it is extractable

contrib/etc/ebusd/mqtt-hassio.cfg

@@ -355,14 +355,14 @@ def_global_updatecheck-payload = %global_prefix,
  }
 
 
-# optional secondary update check for the eBUS device (consuming the same topic though!)
+# optional secondary update check for the enhanced eBUS device (consuming the same topic though!)
 def_global_updatecheck_device-topic = %haprefix/update/%{TOPIC}_device/config
 def_global_updatecheck_device-payload =  {
   "unique_id":"%{TOPIC}_device",
   "device":{
     "identifiers":"%{PREFIXN}_device",
     "manufacturer":"ebusd.eu",
-    "name":"%prefixn device",
+    "name":"%prefixn eBUS device",
     "via_device":"%PREFIXN",
     "suggested_area":"%area"
   },

contrib/etc/ebusd/mqtt-integration.cfg

@@ -178,8 +178,8 @@ def_global-payload = {
 #def_global-retain = 0
 
 # individual global running, version, signal, uptime, updatecheck, and scan config topic, payload, and retain setting.
-# a secondary update check for the eBUS device (consuming the same updatecheck topic) can be set up additionally, which
-# does not use the common global defaults.
+# a secondary update check for the eBUS device (consuming the same updatecheck topic) can be set up, which will only be
+# used if an enhanced eBUS device supporting extra info is present (does not make use of the common global defaults).
 #def_global_running-...
 #def_global_version-...
 #def_global_signal-...