for single-input tasks, do not treat input file singleton list #1577 #1578
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This to restore name and type validation for tools with a single input file.
This handles only single file case, not a bunch of file (some of which could be list). The former might be done by overwriting input sanitizer rather than after form handler. Yet I am not sure for the case of long lists as regex validation is not linear with standard regular expression engine, could create issue