Disable start button until layers have been loaded

small_etl.py

@@ -253,6 +253,9 @@ class SmallETL:
         # Setting up the tableWidgets
         self.set_layer_tables()
 
+        # Enable start button
+        self.dlg.pushButton_Start.setEnabled(True)
+
         logger.info('Layers have been selected. Define new rules or load previously saved config file.')
 
     def set_layer_tables(self):
@@ -357,6 +360,9 @@ class SmallETL:
         self.worker.cancelled.connect(self.thread.quit)
         self.thread.started.connect(self.worker.run) # Connect Thread started signal to Worker operational slot method
 
+        # Disable buttons connected to actions that can't be called at this stage
+        self.dlg.pushButton_Start.setEnabled(False)
+
         # Connect signals
         # Connect click event for Start and Cancel process buttons
         self.dlg.pushButton_Start.clicked.connect(self.on_pb_start)