llama-model: add chat template warning for mistral-v7-tekken

Author: bretello

src/llama-model.cpp

@@ -13786,6 +13786,7 @@ const char * llama_model_chat_template(const llama_model * model, const char * n
         // one-off fix for very popular models (so we are not flooded with issues)
         // do not extend this list unless absolutely necessary
         // Mistral-Small-2503 does not have built-in chat template
+         LLAMA_LOG_WARN("llama_model_chat_template: Couldn't find chat template (tried key %s), falling back to mistral-v7-tekken\n", key.c_str());
         llama_vocab_pre_type pre_type = model->vocab.get_pre_type();
         if (pre_type == LLAMA_VOCAB_PRE_TYPE_TEKKEN && model->layers.size() == 40) {
             return "mistral-v7-tekken";