Update cura/github_ingestion.py

cura/github_ingestion.py

@@ -27,7 +27,7 @@ def ingest_github_repo(repo_name: str, access_token: str):
     list
         A list of strings containing the contents of the files in the repository.
     """
-    if access_token is not "":    
+    if access_token != "":    
         loader = GithubFileLoader(
             repo=repo_name,
             access_token=access_token,