[DRE-maint] Bug#810162: rake assets precompile fails with compass-rails sprockets issue

[Pirate Praveen]

package: diaspora
version: 0.5.4.0+debian-2
severity: grave
justification: fail to install

log for rake assets:precompile attached

praveen at pod:/usr/share/diaspora$ sudo -E -u diaspora bundle exec rake
assets:precompile --trace 2>&1 | tee /tmp/assets-precompile.log

Note: We get to this error after fixing #809755 (reproduced by
0.5.5.1+debian-1 in git)
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