Allow missing descriptions. (#3413)

Author: jack-edmonds-dd

.generator/src/generator/formatter.py

@@ -75,7 +75,7 @@ def is_primitive(schema):
 
 
 def block_comment(comment, prefix="#", first_line=True):
-    lines = comment.split("\n")
+    lines = (comment or "").split("\n")
     start = "" if first_line else lines[0] + "\n"
     return (start + "\n".join(f"{prefix} {line}".rstrip() for line in lines[(0 if first_line else 1) :])).rstrip()