Registering positional argument fails when a previous argument being registered has no "options_list"

[williexu]

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-When a positional argument is registered, it checks the other registered arguments and checks if there are any with no options_list kwarg (which it interprets as a positional argument).

-This will throw an error when a regular argument is registered and no options_list is provided.

Environment summary

Install Method (e.g. pip, interactive script, apt-get, Docker, MSI, edge build) / CLI version (az --version) / OS version / Shell Type (e.g. bash, cmd.exe, Bash on Windows)