Handle bad options syntax in validate-modules.

test/sanity/validate-modules/main.py

@@ -987,7 +987,11 @@ class ModuleValidator(Validator):
         strict_ansible_version = StrictVersion(should_be)
 
         for option, details in options.items():
+            try:
                 names = [option] + details.get('aliases', [])
+            except AttributeError:
+                # Reporting of this syntax error will be handled by schema validation.
+                continue
 
             if any(name in existing_options for name in names):
                 continue