small fix

src/logic/threads.py

@@ -91,6 +91,7 @@ class BookGrabber(QThread):
                 self.updateSignal.emit(item, len(self.data))
             self.logger.log_info("Worker thread finished")
             # self.done.emit()
+            self.stop()
             if not self.is_Running:
                 break
     def stop(self):
@@ -205,6 +206,9 @@ class AutoAdder(QThread):
             # teminate thread
             self.finished.emit()
 
+class BackgroundChecker(QThread):
+    """Check all apparats for available Books"""
+    pass
 
 class MockAvailCheck: