show a different string for "card inserted, but we don't yet know the name on the card"

stepmania/src/arch/MemoryCard/MemoryCardDriver.h

@@ -17,6 +17,7 @@ struct UsbStorageDevice
 		sOsMountDir = "";
 		bNeedsWriteTest = true;
 		bWriteTestSucceeded = false;
+		bIsNameAvailable = false;
 		sName = "";
 		idVendor = 0;
 		idProduct = 0;
@@ -32,6 +33,7 @@ struct UsbStorageDevice
 	CString	sOsMountDir;	// WITHOUT trailing slash
   bool bNeedsWriteTest;
   bool bWriteTestSucceeded;  // only valid if bNeedsWriteTest == false
+  bool bIsNameAvailable;  // Name in the profile on the memory card.
   CString sName;  // Name in the profile on the memory card.
   int idVendor;
   int idProduct;

stepmania/src/arch/MemoryCard/MemoryCardDriverThreaded_Windows.cpp

@@ -103,6 +103,7 @@ void MemoryCardDriverThreaded_Windows::MountThreadDoOneUpdate()
 				Profile profile;
 				CString sProfileDir = TEMP_MOUNT_POINT + PREFSMAN->m_sMemoryCardProfileSubdir + '/'; 
 				profile.LoadEditableDataFromDir( sProfileDir );
+				usbd.bIsNameAvailable = true;
 				usbd.sName = profile.GetDisplayName();
 				UnmountMountPoint( TEMP_MOUNT_POINT );