Check the length of an NDEF message before checking the end terminator

[pete-intranel]

Fixes #2286

Check the length of an NDEF message before checking the end terminator TLV as it is optional and could result in an IndexOfOfRangeException.

Both MifareCard and UltralightCard trim the message on block boundaries before processing the message. This means that if the end of the message falls exactly at the end of a block boundary, the end terminator TLV is trimmed off, causing the descrbed exception.

Microsoft Reviewers: Open in CodeFlow

[pete-intranel]

@dotnet-policy-service agree

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[Ellerbach]

Thanks for the PR following the discussion in the issue. It looks good to me!

[Ellerbach]

azp /run

[joperezr]

/azp run dotnet.iot

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