Prevent IndexError in MethodForm when method registry is empty (fixes #742) - #805

Summary

In MethodForm.__init__, self.fields['method'].initial was unconditionally assigned to method.choices[0][0]. When no methods are registered (or when all methods are unregistered), method.choices is an empty list, leading to an unhandled IndexError: list index out of range and crashing the setup wizard when transitioning to the method step.

Fix

• Guard setting method.initial with if method.choices:.
• Add unit test in tests/test_forms.py verifying MethodForm initialization with an empty registry.
• Add unit test in tests/test_views_setup.py verifying SetupView handles an empty registry gracefully without raising an unhandled exception.

Fixes #742.