Fixed build without CUDA

modules/gpu/src/orb.cpp

@@ -48,7 +48,7 @@ using namespace cv::gpu;
 
 #if !defined (HAVE_CUDA)
 
-cv::gpu::ORB_GPU::ORB_GPU(int, float, int, int, int, int, int, int) { throw_nogpu(); }
+cv::gpu::ORB_GPU::ORB_GPU(int, float, int, int, int, int, int, int) : fastDetector_(20) { throw_nogpu(); }
 void cv::gpu::ORB_GPU::operator()(const GpuMat&, const GpuMat&, std::vector<KeyPoint>&) { throw_nogpu(); }
 void cv::gpu::ORB_GPU::operator()(const GpuMat&, const GpuMat&, GpuMat&) { throw_nogpu(); }
 void cv::gpu::ORB_GPU::operator()(const GpuMat&, const GpuMat&, std::vector<KeyPoint>&, GpuMat&) { throw_nogpu(); }
@@ -397,7 +397,7 @@ namespace
 }
 
 cv::gpu::ORB_GPU::ORB_GPU(int nFeatures, float scaleFactor, int nLevels, int edgeThreshold, int firstLevel, int WTA_K, int scoreType, int patchSize) :
-    nFeatures_(nFeatures), scaleFactor_(scaleFactor), nLevels_(nLevels), edgeThreshold_(edgeThreshold), firstLevel_(firstLevel), WTA_K_(WTA_K),
+    nFeatures_(nFeatures), scaleFactor_(scaleFactor), nLevels_(nLevels), edgeThreshold_(edgeThreshold), firstLevel_(firstLevel), WTA_K_(WTA_K),
     scoreType_(scoreType), patchSize_(patchSize),
     fastDetector_(DEFAULT_FAST_THRESHOLD)
 {