Fix set up issue AGAIN

binary_sensor.py

@@ -114,7 +114,8 @@ class MedMateDoseDueSensor(MedMateBaseBinarySensor):
                     next_dose = datetime.fromisoformat(next_dose)
                 except ValueError:
                     next_dose = None
-            attrs["next_dose"] = next_dose
+            if next_dose:
+                attrs["next_dose"] = next_dose
             
         return attrs
 
@@ -146,10 +147,18 @@ class MedMatePrescriptionActiveSensor(MedMateBaseBinarySensor):
         data = self.coordinator.data
         prescription = data.get(CONF_PRESCRIPTION, {})
         
-        return {
-            "expiry_date": prescription.get(CONF_EXPIRY_DATE),
-            "repeats_left": prescription.get(CONF_REPEATS_LEFT, 0),
-        }
+        # Only return expected keys
+        attrs = {}
+        
+        expiry_date = prescription.get(CONF_EXPIRY_DATE)
+        if expiry_date:
+            attrs["expiry_date"] = expiry_date
+            
+        repeats_left = prescription.get(CONF_REPEATS_LEFT)
+        if repeats_left is not None:
+            attrs["repeats_left"] = repeats_left
+            
+        return attrs
 
 
 class MedMateLowInventorySensor(MedMateBaseBinarySensor):
@@ -176,7 +185,6 @@ class MedMateLowInventorySensor(MedMateBaseBinarySensor):
         inventory = data.get("inventory", 0)
         
         # Consider inventory low if less than 7 doses remain
-        # This assumes daily medication - could be made configurable
         return inventory < 7
 
     @property