error out if the path to the updater config is empty

Change-Id: Ic199b15222836e096e32203d3458487fead6e3e1

bin/update/config.py

+
+import configparser
+
+class Config(object):
+
+    def __init__(self):
+        self.certificate_path = None
+        self.certificate_name = None
+        self.channel = None
+        self.base_url = None
+        self.upload_url = None
+
+def parse_config(config_file):
+    config = configparser.ConfigParser()
+    config.read(config_file)
+
+    data = Config()
+    updater_data = config['Updater']
+    data.base_url = updater_data['base-url']
+    data.certificate_name = updater_data['certificate-name']
+    data.certificate_path = updater_data['certificate-path']
+    data.channel = updater_data['channel']
+    data.upload_url = updater_data['upload-url']
+
+    return data

bin/update/create_full_mar.py

@@ -27,6 +27,10 @@ def main():
     workdir = sys.argv[2]
     product_name = sys.argv[1]
 
+    if len(update_config) == 0:
+        print("missing update config")
+        sys.exit(1)
+
     config = parse_config(update_config)
 
     tar_dir = os.path.join(workdir, "installation", product_name, "archive", "install", "en-US")