feat: Improve patch formatting and handle empty data in pr_code_suggestions.py

pr_agent/algo/pr_processing.py

@@ -375,6 +375,13 @@ def get_pr_multi_diffs(git_provider: GitProvider,
     for lang in pr_languages:
         sorted_files.extend(sorted(lang['files'], key=lambda x: x.tokens, reverse=True))
 
+
+    # try first a single run with standard diff string, with patch extension, and no deletions
+    patches_extended, total_tokens, patches_extended_tokens = pr_generate_extended_diff(
+        pr_languages, token_handler, add_line_numbers_to_hunks=True)
+    if total_tokens + OUTPUT_BUFFER_TOKENS_SOFT_THRESHOLD < get_max_tokens(model):
+        return ["\n".join(patches_extended)]
+
     patches = []
     final_diff_list = []
     total_tokens = token_handler.prompt_tokens