Fix channel scan insertion (wasn't being called).

The Teardown() call is actually deleting sigmonScanner these days,
so we can't require that it still exists before starting processing.

mythtv/libs/libmythtv/channelscan/channelscanner_gui.cpp

@@ -115,8 +115,7 @@ void ChannelScannerGUI::HandleEvent(const ScannerEvent *scanEvent)
         Teardown();
 
         int ret = scanEvent->intValue();
-        if (sigmonScanner &&
-            (!transports.empty() || (MythDialog::Rejected != ret)))
+        if (!transports.empty() || (MythDialog::Rejected != ret))
         {
             Process(transports);
         }