Grayscale colorization model (https://github.com/richzhang/colorization) test.

modules/dnn/src/layers/scale_layer.cpp

@@ -33,6 +33,7 @@ public:
                          std::vector<MatShape> &outputs,
                          std::vector<MatShape> &internals) const
     {
+        CV_Assert(blobs.size() == 1 + hasBias);
         Layer::getMemoryShapes(inputs, requiredOutputs, outputs, internals);
         return true;
     }
@@ -48,8 +49,6 @@ public:
         CV_TRACE_FUNCTION();
         CV_TRACE_ARG_VALUE(name, "name", name.c_str());
 
-        CV_Assert(blobs.size() == 1 + hasBias);
-
         for (size_t ii = 0; ii < outputs.size(); ii++)
         {
             Mat &inpBlob = *inputs[ii];