Ignore HTML in flutter_markdown content without error (#8420)

* Gracefully ignore html content

* Test for less than, consolidate table tests

* Specify missing type annotation

* Add Mike Hoolehan to AUTHORS
diff --git a/AUTHORS b/AUTHORS
index 1532b60..b5c914b 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -14,3 +14,4 @@
 Alexandre Ardhuin <alexandre.ardhuin@gmail.com>
 Luke Freeman <luke@goposse.com>
 Vincent Le Quéméner <eu.lequem@gmail.com>
+Mike Hoolehan <mike@hoolehan.com>