google-assistant-sdk: sync hotword sample

Change-Id: I2b62c8c1adca24599ef638af5a7d6c1be4b6b80c

Author: proppy

google-assistant-sdk/googlesamples/assistant/library/hotword.py

@@ -41,7 +41,7 @@ def process_device_actions(event, device_id):
                         if device['id'] == device_id:
                             if 'execution' in c:
                                 for e in c['execution']:
-                                    if e['params']:
+                                    if 'params' in e:
                                         yield e['command'], e['params']
                                     else:
                                         yield e['command'], None
@@ -114,10 +114,18 @@ def main():
     parser.add_argument('--device_model_id', type=str,
                         metavar='DEVICE_MODEL_ID', required=True,
                         help='The device model ID registered with Google')
-    parser.add_argument('--project_id', type=str,
-                        metavar='PROJECT_ID', required=False,
-                        help=('The project ID used to register'
-                              'device instances'))
+    parser.add_argument(
+        '--project_id',
+        type=str,
+        metavar='PROJECT_ID',
+        required=False,
+        help='The project ID used to register device instances.')
+    parser.add_argument(
+        '-v',
+        '--version',
+        action='version',
+        version='%(prog)s ' +
+        Assistant.__version_str__())
 
     args = parser.parse_args()
     with open(args.credentials, 'r') as f: