Fixed issue where blacs couldn't close with certain tabs

blacs/__main__.py

@@ -602,7 +602,9 @@ def on_save_exit(self):
         self.front_panel_settings.save_front_panel_to_h5(self.settings_path,data[0],data[1],data[2],data[3],{"overwrite":True},force_new_conn_table=True)
         logger.info('Shutting down workers')
         for tab in self.tablist.values():
-            tab.shutdown_workers()
+            # Tell tab to shutdown its workers if it has a method to do so.
+            if hasattr(tab, 'shutdown_workers'):
+                tab.shutdown_workers()
 
         QTimer.singleShot(100, self.finalise_quit)
 
@@ -616,6 +618,14 @@ def finalise_quit(self, deadline=None, pending_threads=None):
         overdue = time.time() > deadline
         # Check for worker shutdown completion:
         for name, tab in list(self.tablist.items()):
+            # Immediately close tabs that don't support finalise_close_tab()
+            if not hasattr(tab, 'finalise_close_tab'):
+                try:
+                    current_page = tab.close_tab(finalise=False)
+                except Exception as e:
+                    logger.error('Couldn\'t close tab:\n%s' % str(e))
+                del self.tablist[name]
+                continue
             fatal_error = tab.state == 'fatal error'
             if not tab.shutdown_workers_complete and overdue or fatal_error:
                 # Give up on cleanly shutting down this tab's worker processes: