Merge pull request django-compressor#478 from iknite/fix_477

Fix: django-compressor#477 Enhanced Error display if COMPRESS_ROOT nor STATIC_ROOT is defined

Author: agriffis

compressor/conf.py

@@ -77,7 +77,8 @@ def configure_root(self, value):
         if value is None:
             value = settings.STATIC_ROOT
         if value is None:
-            raise ImproperlyConfigured("COMPRESS_ROOT setting must be set")
+            raise ImproperlyConfigured('COMPRESS_ROOT defaults to ' +
+                                       'STATIC_ROOT, please define either')
         return os.path.normcase(os.path.abspath(value))
 
     def configure_url(self, value):