protection for no language

pr_agent/git_providers/git_provider.py

@@ -132,6 +132,10 @@ def get_main_pr_language(languages, files) -> str:
     Get the main language of the commit. Return an empty string if cannot determine.
     """
     main_language_str = ""
+    if not languages:
+        logging.info("No languages detected")
+        return main_language_str
+
     try:
         top_language = max(languages, key=languages.get).lower()