Use unlink from python-application

blink/contacts.py

@@ -874,10 +874,7 @@ class ContactModel(QAbstractListModel):
                 items = pickle.load(file)
             except Exception:
                 # remove the corrupted contacts file, so it won't be backed up to contacts.bak later
-                try:
-                    os.unlink(ApplicationData.get('contacts'))
-                except Exception:
-                    pass
+                unlink(ApplicationData.get('contacts'))
                 file = open(ApplicationData.get('contacts.bak'))
                 items = pickle.load(file)
                 file = None # restore contacts from contacts.bak