Make sure that floppy icons and options do not appear if there's no floppy controller available

src/qt/qt_machinestatus.cpp

@@ -40,6 +40,8 @@ extern "C" {
 #include <86box/ui.h>
 #include <86box/machine_status.h>
 #include <86box/config.h>
+
+extern volatile int fdcinited;
 };
 
 #include <QIcon>
@@ -303,6 +305,9 @@ MachineStatus::hasSCSI()
 void
 MachineStatus::iterateFDD(const std::function<void(int)> &cb)
 {
+    if (!fdcinited)
+        return;
+
     for (int i = 0; i < FDD_NUM; ++i) {
         if (fdd_get_type(i) != 0) {
             cb(i);