Update ManagementForm to validate current_step
#224
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Previously, bots could and would stuff this form value with all kinds of nonsense, triggering a server error (and subsequent alert emails). Supersedes jazzband#47
jsma
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Nov 3, 2022
This removes the undocumented `get_form_list` since the process of repeatedly and dynamically generating an OrderedDict of steps/forms pairs leads to infinite recursion. This is replaced with a new method `process_condition_dict` which directly modifies `form_list` in place, in a single step executed prior to dispatching to `get` or `post`. This eliminates infinite recursion since the `form_list` is calculated exactly once prior to any other attempts to access and process forms. Removed `test_form_condition_unstable` since this is an odd test (why would a condition_dict return value suddenly change in the middle of a request/response cycle?) that was attempting to deal with invalid steps (invalid steps are better handled through actual validation, see jazzband#224). For users who need to dynamically _add_ forms, this can be handled by overriding `process_condition_dict`.
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Previously, bots could and would stuff this form value with all kinds of nonsense, triggering a server error (and subsequent alert emails). Supersedes #47 and should fix #38