Improve FILAMENT_RUNOUT_SENSOR, FILRUNOUT_PIN

Marlin/SanityCheck.h

@@ -124,6 +124,17 @@
   #endif
 #endif
 
+/**
+ * Filament Runout needs a pin and SD Support
+ */
+#if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #if !HAS_FILRUNOUT
+    #error "FILAMENT_RUNOUT_SENSOR requires FILRUNOUT_PIN."
+  #elif DISABLED(SDSUPPORT)
+    #error "FILAMENT_RUNOUT_SENSOR requires SDSUPPORT."
+  #endif
+#endif
+
 /**
  * Filament Change with Extruder Runout Prevention
  */