Mutual inductance statements have no model.

eeschema/sim/sim_model_l_mutual.cpp

@@ -2,7 +2,7 @@
  * This program source code file is part of KiCad, a free EDA CAD application.
  *
  * Copyright (C) 2022 Mikolaj Wielgus
- * Copyright (C) 2022 KiCad Developers, see AUTHORS.txt for contributors.
+ * Copyright (C) 2022-2024 KiCad Developers, see AUTHORS.txt for contributors.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License

eeschema/sim/sim_model_l_mutual.h

@@ -34,6 +34,11 @@ class SPICE_GENERATOR_L_MUTUAL : public SPICE_GENERATOR
 public:
     using SPICE_GENERATOR::SPICE_GENERATOR;
 
+    std::string ItemModelName( const SPICE_ITEM& aItem ) const override
+    {
+        return "";
+    }
+
     std::string ItemParams() const override;
 };