cyberdelia/django-pipeline — pull request #41 by chipx86 (2011-11-14 11:34:26+00:00)
Title: Don't attempt to compress CSS or JS if the compressor class is empty.

The CSS and JS compressors can be turned off individually by specifying
either None or an empty string as the value for either
PIPELINE_CSS_COMPRESSOR or PIPELINE_JS_COMPRESSOR.

This is useful when you want to conditionally disable a compressor based
on what's available locally, or when a byproduct of a compiler is to
compress the content.