skip -1 tok in loop to avoid send '' on end

Author: jhen0409

examples/server/server.cpp

@@ -1322,10 +1322,13 @@ int main(int argc, char **argv)
 
                 while (llama.has_next_token) {
                     const completion_token_output token_with_probs = llama.doCompletion();
-                    const std::string token_text = token_with_probs.tok == -1 ? "" : llama_token_to_str(llama.ctx, token_with_probs.tok);
-                    if (llama.multibyte_pending > 0) {
+                    if (
+                        token_with_probs.tok == -1 ||
+                        sent_count == llama.generated_text.size()
+                    ) {
                         continue;
                     }
+                    const std::string token_text = llama_token_to_str(llama.ctx, token_with_probs.tok);
 
                     size_t pos = std::min(sent_count, llama.generated_text.size());