bugfixes: events without data-folder error

If an event didn't have a folder for files it was erroring.
This is fixed now by adding try-except blocks.

README.md

@@ -32,7 +32,8 @@ the last time running it.
 
 ### Errors and workarounds
 
-- [ ] if filename is too long it currently gets skipped
+- [ ] If filename is too long it currently gets skipped
+- [ ] Filenames get sometimes displayed wrong (probably utf8 problems)
 
 ## Installation
 

src/crawler.py

@@ -40,7 +40,7 @@ class Crawler:
             self.create_dir(subdir_path)
             os.chdir(subdir_path)
             self.download_folder_rec(subdir, subdir_path)
-        log.info('Finished crawling folder ' + folder)
+        log.info('finished crawling folder ' + folder)
 
     def download_course(self, course, base_dir):
         """Download all documents in course.
@@ -55,7 +55,7 @@ class Crawler:
         os.chdir(base_dir)
         root = self.studip.get_top_folder(course)
         self.download_folder_rec(root, base_dir)
-        log.info('Finished crawling course ' + course)
+        log.info('finished crawling course ' + course)
 
     def download_curr_courses(self, base_dir):
         """Download all documents of all current courses.
@@ -74,7 +74,7 @@ class Crawler:
             course_name = curr_courses[course].replace('/', '-')
             path = os.path.join(base_dir, course_name)
             self.download_course(course, path)
-        log.info('Finished crawling all current courses')
+        log.info('finished crawling all current courses')
 
     def create_dir(self, dir):
         """Creates a dir if it doesnt exist already.

src/studip.py

@@ -121,11 +121,17 @@ class Studip:
         list(string): ids of the documents
         """
         rsp = self.auth_req('/api.php/folder/' + folder)
-        docs = rsp.json()['file_refs']
         res_docs = []
+        try:
+            docs = rsp.json()['file_refs']
+        except ValueError:
+            return res_docs
         for doc in docs:
+            try:
                 doc_id = doc['id']
                 res_docs.append(doc_id)
+            except KeyError:
+                return res_docs
         return(res_docs)
 
     def download(self, doc):
@@ -161,11 +167,17 @@ class Studip:
         Returns:
         list(string): ids of the subdirectories
         """
+        res_subdirs = {}
         rsp = self.auth_req('/api.php/folder/' + folder)
+        try:
             subdirs = rsp.json()['subfolders']
-        res_subdirs = {}
+        except ValueError:
+            return res_docs
         for subdir in subdirs:
+            try:
                 sub_id = subdir['id']
                 sub_name = subdir['name']
                 res_subdirs[sub_id] = sub_name
+            except KeyError:
+                return res_subdirs
         return res_subdirs