Revert "Check color mode values for emptiness (rytilahti#829)"

This reverts commit fc67404.

miio/yeelight.py

@@ -39,9 +39,8 @@ def brightness(self) -> int:
     @property
     def rgb(self) -> Optional[Tuple[int, int, int]]:
         """Return color in RGB if RGB mode is active."""
-        rgb = self.data["rgb"]
-        if self.color_mode == YeelightMode.RGB and rgb:
-            return int_to_rgb(int(rgb))
+        if self.color_mode == YeelightMode.RGB:
+            return int_to_rgb(int(self.data["rgb"]))
         return None
 
     @property
@@ -52,19 +51,15 @@ def color_mode(self) -> YeelightMode:
     @property
     def hsv(self) -> Optional[Tuple[int, int, int]]:
         """Return current color in HSV if HSV mode is active."""
-        hue = self.data["hue"]
-        sat = self.data["sat"]
-        brightness = self.data["bright"]
-        if self.color_mode == YeelightMode.HSV and (hue or sat or brightness):
-            return hue, sat, brightness
+        if self.color_mode == YeelightMode.HSV:
+            return self.data["hue"], self.data["sat"], self.data["bright"]
         return None
 
     @property
     def color_temp(self) -> Optional[int]:
         """Return current color temperature, if applicable."""
-        ct = self.data["ct"]
-        if self.color_mode == YeelightMode.ColorTemperature and ct:
-            return int(ct)
+        if self.color_mode == YeelightMode.ColorTemperature:
+            return int(self.data["ct"])
         return None
 
     @property