remove unneeded dependency, use try catch when writing files

src/main/kotlin/org/mosad/thecitadelofricks/controller/CacheController.kt

@@ -190,12 +190,16 @@ class CacheController {
          * @param timetable a timetable of the type [TimetableCourseWeek]
          */
         private fun saveTimetableToCache(timetable: TimetableCourseWeek) {
-            println(timetable.timetable.toString())
-
             val file = File(StartupController.dirTcorCache, "timetable-${timetable.meta.courseName}-${timetable.meta.weekIndex}.json")
             val writer = BufferedWriter(FileWriter(file))
-            writer.write(Gson().toJson(timetable))
-            writer.close()
+
+            try {
+                writer.write(Gson().toJson(timetable))
+            } catch (e: Exception) {
+                logger.error("something went wrong while trying to write a cache file", e)
+            } finally {
+                writer.close()
+            }
         }
 
         /**