FormHttpMessageConverter#writePart NPE on 'partBody.getClass()' [SPR-10187]

[spring-projects-issues]

Artem Bilan opened SPR-10187 and commented

The simple way to reproduce just make one of values as null in the FormHttpMessageConverterTests#writeMultipart().
At a glance it seems like enough to skip such 'parts'.

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Affects: 3.1.3, 3.2 GA

Referenced from: commits b1267b9, 0c56e86

Backported to: 3.1.4