Fixes for "Read Models and Settings from the radio": (#4291)

* show errors
 * close dialog in nothing in progress widget

companion/src/progressdialog.cpp

@@ -18,6 +18,7 @@
  * GNU General Public License for more details.
  */
 
+#include "progresswidget.h"
 #include "progressdialog.h"
 #include "ui_progressdialog.h"
 #include "appdata.h"
@@ -71,3 +72,8 @@ void ProgressDialog::shrink()
 {
   resize(0, 0);
 }
+
+bool ProgressDialog::isEmpty() const
+{
+  return ui->outputProgress->isEmpty();
+}