'Improve and remove sensitive information from sass/less compilator error messages'

def get_preprocessor_error(self, stderr, source=None):

    error = misc.ustr(stderr).split('Load    paths')[0].replace('        Use    --trace    for    backtrace.', '')
    if ('Cannot    load    compass' in error):
        error += 'Maybe    you    should    install    the    compass    gem    using    this    extra    argument:\n\n                $    sudo    gem    install    compass    --pre\n'
    error += ("This    error    occured    while    compiling    the    bundle    '%s'    containing:" % self.name)
    for asset in self.stylesheets:
        if isinstance(asset, PreprocessedCSS):
            error += ('\n                -    %s' % (asset.url if asset.url else '<inline    sass>'))
    return error
