No empty strings

src/freedombone-controlpanel

@@ -1040,12 +1040,14 @@ function restore_data_from_storage {
         do
             app_index=$[choice-2]
             app_name=${app_list[app_index]}
+            if [ ${#app_name} -gt 0 ]; then
                 $restore_command "${app_name}"
                 if [ ! "$?" = "0" ]; then
                     dialog --title $"Restore apps from USB" \
                            --msgbox $"Restore of ${app_name} failed with code $?" 6 40
                     return
                 fi
+            fi
             ctr=$((ctr + 1))
         done
         if [ $ctr -gt 0 ]; then