Diverse Code Cleanups

*Code wurde PEP-8 gerecht formatiert
* Kleine Fehler die der PyCharm Inspector beanstandet wurden korrigiert

utils/massmailer.py

@@ -6,11 +6,11 @@ from django.template import loader, Context
 
 
 class MassMailer(object):
-    '''
+    """
     This Class will send E-Mails via an SMTP Connection to multiple recipients.
     Each E-Mail will be send individually and can be personalized.
     It will be send as HTML and Plain-Text Message.
-    '''
+    """
     context = {}
     headers = {}
     subject = None
@@ -83,9 +83,9 @@ class MassMailer(object):
         self.headers[name] = value
 
     def send(self):
-        '''
+        """
         Process the E-Mails and send them
-        '''
+        """
         self.process_mails()
         if len(self.mail_queue) == 0:
             self.log.info('No recipients for eMail "%s", bye!', self.subject)