OpenCoreMisc: Use builtin picker when external picker fails to load

Changelog.md

@@ -12,6 +12,7 @@ OpenCore Changelog
 - Fixed unrecognised select `com.apple.recovery.boot` entries
 - Changed NVRAM reset not to erase `BootProtect` boot options
 - Improved boot performance when picker UI is disabled
+- Enforced the use of builtin picker when external fails
 
 #### v0.5.8
 - Fixed invalid CPU object reference in SSDT-PLUG

Platform/OpenCore/OpenCoreMisc.c

@@ -713,9 +713,15 @@ OcMiscBoot (
 
   if (Interface != NULL) {
     Status = Interface->ShowInteface (Interface, Storage, Context);
+    DEBUG ((DEBUG_WARN, "OC: External interface failure, fallback to builtin - %r\n", Status));
   } else {
+    Status = EFI_UNSUPPORTED;
+  }
+
+  if (EFI_ERROR (Status)) {
     Status = OcRunBootPicker (Context);
   }
+
   if (EFI_ERROR (Status)) {
     DEBUG ((DEBUG_ERROR, "OC: Failed to show boot menu!\n"));
   }