fix blank lines at end of csv

app/s3_client/s3_csv_client.py

@@ -29,6 +29,10 @@ def get_csv_upload(service_id, upload_id):
 
 
 def s3upload(service_id, filedata):
+    # sometimes people upload files with hundreds of blank lines at the end
+    data = filedata["data"]
+    cleaned_data = "\n".join(line for line in data.splitlines() if line.strip())
+    filedata["data"] = cleaned_data
 
     upload_id = str(uuid.uuid4())
     bucket_name, file_location, access_key, secret_key, region = get_csv_location(