Anonymous comments with grade affect the grading system before validation

[lbarman]

The "distribution" visible on course descriptions (http://courseadvisor.ch/fr/course/computer-language-processing-323 for instance) is immediately affected by grades associated anonymous comments.

It should not be, as those comments are manually validated; It leads to an inconsistant number of comments / votes while the comment is not approved.

To check : if the anonymous comment is rejected, the grade should be removed as well.