Fix edge case with missing dealer, and update README

README.md

@@ -11,7 +11,13 @@ This was originally written before [alerts](https://www.redflagdeals.com/alerts/
 
 ## Usage
 
-To run the code directly, clone this repo and run the following:
+The simplest way to get started is to clone this repo, and run with docker:
+
+```sh
+docker run -it -v "$(pwd)/examples/config.yml:/app/config.yml"  ghcr.io/davegallant/rfd-notify:1
+```
+
+To run the code with [poetry](https://python-poetry.org/), clone this repo and run the following:
 
 ```shell
 poetry install

rfd_notify/rfd.py

@@ -63,7 +63,10 @@ def look_for_matches(
             for expression in config.expressions:
                 expression = expression.lower()
                 topic_title = topic.title.lower()
-                dealer_name = topic.offer.dealer_name.lower()
+                if topic.offer.dealer_name:
+                    dealer_name = topic.offer.dealer_name.lower()
+                else:
+                    dealer_name = ""
                 if re.search(expression, topic_title):
                     found_match = True
                     logger.debug(