Add some docs and doctests to things that have 0% coverage.

1 files changed, 6 insertions, 2 deletions

diff --git a/smart_home/cameras.py b/smart_home/cameras.py
index 8643611..e8f164b 100644
--- a/smart_home/cameras.py
+++ b/smart_home/cameras.py
@@ -5,6 +5,7 @@
 """Utilities for dealing with the webcams."""
 
 import logging
+from typing import Optional
 
 import scott_secrets
 import smart_home.device as dev
@@ -29,9 +30,12 @@ class BaseCamera(dev.Device):
         super().__init__(name.strip(), mac.strip(), keywords)
         self.camera_name = BaseCamera.camera_mapping.get(name, None)
 
-    def get_stream_url(self) -> str:
+    def get_stream_url(self) -> Optional[str]:
+        """Get the URL for the webcam's live stream.  Return None on error."""
+
         name = self.camera_name
-        assert name is not None
+        if not name:
+            return None
         if name == 'driveway':
             return f'http://10.0.0.226:8080/{scott_secrets.SHINOBI_KEY1}/mjpeg/{scott_secrets.SHINOBI_KEY2}/driveway'
         else: