Opt: wait until navbar active is not None (#3832)

module/gacha/ui.py

@@ -103,17 +103,15 @@ class GachaUI(UI):
     def _construct_bottom_navbar(self):
         """
         limited 4 options
-            build.
-            limited_build.
-            orders.
-            shop.
-            retire.
+            event.
+            light.
+            heavy.
+            special.
 
         regular 3 options
-            build.
-            orders.
-            shop.
-            retire.
+            light.
+            heavy.
+            special.
         """
         construct_bottom_navbar = ButtonGrid(
             origin=(262, 615), delta=(209, 0),

module/ui/navbar.py

@@ -188,7 +188,8 @@ class Navbar:
             active, minimum, maximum = self.get_info(main=main)
             logger.info(f'Nav item active: {active} from range ({minimum}, {maximum})')
             # Get None when receiving a pure black screenshot.
-            if minimum is None or maximum is None:
+            # Active is None could be because of slow animation
+            if active is None or minimum is None or maximum is None:
                 continue
 
             index = minimum + left - 1 if left is not None else maximum - right + 1