Fixed cvDestroyAllWindows() without windows in QT (#2440)

3c878798 · Ilya Lysenkov · 56fbcc54 · 3c878798
Commit 3c878798 authored Jan 30, 2013 by Ilya Lysenkov
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window_QT.cpp modules/highgui/src/window_QT.cpp +1 -1

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--- a/modules/highgui/src/window_QT.cpp
+++ b/modules/highgui/src/window_QT.cpp
@@ -499,7 +499,7 @@ CV_IMPL void cvDestroyWindow(const char* name)
 CV_IMPL void cvDestroyAllWindows()
 {
    if (!guiMainThread)
-        CV_Error( CV_StsNullPtr, "NULL guiReceiver (please create a window)" );
+        return;
    QMetaObject::invokeMethod(guiMainThread,
        "destroyAllWindow",