Hotfix: Add params parsing

When favoriting from `show_basic` for courses, the parameters `number`
and `semester` are not passed to the underlying function. Instead, the
`detail_url` is passed, which has to be parsed to get the `number` and
`semester`.

app/controllers/crawlers/courses_crawler_controller.rb

@@ -51,6 +51,12 @@ class Crawlers::CoursesCrawlerController < Crawlers::TissCrawlerController
 
   def add_to_fav
     params[:api] = '/api/course/'
+    if (params[:number] || params[:semester]) == nil
+      regex = params[:detail_url].match(/courseNr=(?<number>\S{6})/)
+      params[:number] = regex[:number]
+      regex = params[:detail_url].match(/semester=(?<semester>\d{4}[SW])/)
+      params[:semester] = regex[:semester]
+    end
 
     @course = TissCrawler.get_course_details(params)