Add some log output if the cached files cannot be found

Signed-off-by: AMZN-Phil <pconroy@amazon.com>

scripts/o3de/o3de/repo.py

@@ -102,6 +102,7 @@ def get_gem_json_paths_from_cached_repo(repo_uri : str) -> list:
 
     file_name = pathlib.Path(cache_filename).resolve()
     if not file_name.is_file():
+        logger.error(f'Could not find cached repo json file for {repo_uri}')
         return gem_list
 
     with file_name.open('r') as f:
@@ -124,6 +125,7 @@ def get_gem_json_paths_from_cached_repo(repo_uri : str) -> list:
                 manifest_json_sha256 = hashlib.sha256(manifest_json_uri.encode())
                 cache_gem_json_filepath = cache_folder / str(manifest_json_sha256.hexdigest() + '.json')
                 if cache_gem_json_filepath.is_file():
+                    logger.warn(f'Could not find cached gem json file for {o3de_object_uri} in repo {repo_uri}')
                     gem_list.append(cache_gem_json_filepath)
 
     return gem_list