Relax field name check when mapping query fields projection [DATAMONGO-2120]

**[Christoph Strobl](https://jira.spring.io/secure/ViewProfile.jspa?name=cstrobl)** opened **[DATAMONGO-2120](https://jira.spring.io/browse/DATAMONGO-2120?redirect=false)** and commented


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**Reference URL:** https://stackoverflow.com/questions/52875213/springdata-mongotemplate-include-ifnull
