ConvBackPropData dynamic output shape input (#4314)

* ConvBackPropData dynamic output shape input

* Adam comments
Co-authored-by: aslepko <44713115+aslepko@users.noreply.github.com>
Co-authored-by: Robert Kimball <robert.kimball@intel.com>
Co-authored-by: Scott Cyphers <diyessi@users.noreply.github.com>

src/ngraph/op/convolution.cpp

@@ -255,6 +255,10 @@ const PartialShape op::v1::ConvolutionBackpropData::get_output_shape() const
         {
             shape = const_op->get_shape_val();
         }
+        else
+        {
+            shape = PartialShape::dynamic();
+        }
     }
     return shape;
 }

src/ngraph/op/fused/group_conv.cpp

@@ -249,6 +249,10 @@ const PartialShape op::v1::GroupConvolutionBackpropData::get_output_shape() cons
         {
             shape = const_op->get_shape_val();
         }
+        else
+        {
+            shape = PartialShape::dynamic();
+        }
     }
     return shape;
 }