Sanity-check some graphical LCD-only options

Marlin/src/inc/SanityCheck.h

@@ -375,6 +375,13 @@ static_assert(X_MAX_LENGTH >= X_BED_SIZE && Y_MAX_LENGTH >= Y_BED_SIZE,
   #error "LCD_SET_PROGRESS_MANUALLY requires LCD_PROGRESS_BAR or Graphical LCD."
 #endif
 
+/**
+ * Custom Boot and Status screens
+ */
+#if DISABLED(DOGLCD) && (ENABLED(SHOW_CUSTOM_BOOTSCREEN) || ENABLED(CUSTOM_STATUS_SCREEN_IMAGE))
+  #error "Graphical LCD is required for SHOW_CUSTOM_BOOTSCREEN and CUSTOM_STATUS_SCREEN_IMAGE."
+#endif
+
 /**
  * SD File Sorting
  */