fix save bugs

sam_ann/widgets/mainwindow.py

@@ -44,7 +44,7 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
         self.current_index = None
         self.current_file_index: int = None
 
-        self.current_label = '__background__'
+        self.current_cat = '__background__'
         self.current_group = 1
 
         self.config_file = CONFIG_FILE if os.path.exists(CONFIG_FILE) else DEFAULT_CONFIG_FILE
@@ -351,7 +351,6 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
 
     def show_image(self, index:int):
         self.reset_action()
-        self.current_label = None
         self.load_finished = False
         self.saved = True
         if not -1 < index < len(self.files_list):
@@ -368,8 +367,11 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
             self.actionFinish.setEnabled(True)
             self.actionCancel.setEnabled(True)
             self.actionVisible.setEnabled(True)
+            self.load_finished = True
             return
         try:
+            self.current_label = None
+            
             self.scene.cancel_draw()
         
             self.polygons.clear()