fix mising default role_dir

ansibledoctor/Annotation.py

@@ -102,9 +102,9 @@ class Annotation:
             try:
                 content = {key: json.loads(parts[2].strip())}
             except ValueError:
-                content = {key: parts[2].strip()}
+                content = [parts[2].strip()]
         else:
-            content = parts[2]
+            content = [parts[2]]
 
         item.data[key][parts[1]] = content
 

ansibledoctor/Cli.py

@@ -35,7 +35,7 @@ class AnsibleDoctor:
         # TODO: add function to print to stdout instead of file
         parser = argparse.ArgumentParser(
             description="Generate documentation from annotated Ansible roles using templates")
-        parser.add_argument("role_dir", help="role directory (default: current working dir)")
+        parser.add_argument("role_dir", nargs="?", help="role directory (default: current working dir)")
         parser.add_argument("-c", "--config", dest="config_file", help="location of configuration file")
         parser.add_argument("-o", "--output", dest="output_dir", action="store",
                             help="output base dir")