bugfix:
error listing multiple eduyears and semester and putting it to query string

Signed-off-by: semteacher <semteacher@gmail.com>
allow to select module data separately by:
-variant_id
-year
-semester

Signed-off-by: semteacher <semteacher@gmail.com>
Merge branch 'hotfix'
Merge pull request #6 from semteacher/master

 bugfix when select multiple module data together