Bugfix homematic available modus (#11256)

homeassistant/components/homematic/__init__.py

@@ -749,10 +749,6 @@ class HMDevice(Entity):
         """Return device specific state attributes."""
         attr = {}
 
-        # No data available
-        if not self.available:
-            return attr
-
         # Generate a dictionary with attributes
         for node, data in HM_ATTRIBUTE_SUPPORT.items():
             # Is an attribute and exists for this object
@@ -808,6 +804,9 @@ class HMDevice(Entity):
         if attribute == 'UNREACH':
             self._available = bool(value)
             has_changed = True
+        elif not self.available:
+            self._available = False
+            has_changed = True
 
         # If it has changed data point, update HASS
         if has_changed: