Add remove regex default to TemplateExporter, don't remove cells with outputs but no source #616
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Closes #615.
This enables RegexRemovePreprocessor in the TemplateExporter.
It also changes its behaviour to not remove cells that do have output even if they match the regular expression (which, by default, is the empty string).
@tillahoffmann is this consistent with your original intended use of this preprocessor (keeping in mind that tag-based input filtering should also be possible soon)?