COMPMID-1040: Added support for nullptr bias tensor in NEWinogradLayer

Change-Id: Ie624ee17c63dede711d913a82819e128954a57c9
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/124861
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/src/core/NEON/kernels/NEWinogradLayerKernel.cpp b/src/core/NEON/kernels/NEWinogradLayerKernel.cpp
index b2e44f8..fcd1594 100644
--- a/src/core/NEON/kernels/NEWinogradLayerKernel.cpp
+++ b/src/core/NEON/kernels/NEWinogradLayerKernel.cpp
@@ -299,12 +299,11 @@
 {
     ARM_COMPUTE_UNUSED(info);
     ARM_COMPUTE_ERROR_ON_UNCONFIGURED_KERNEL(this);
-    ARM_COMPUTE_ERROR_ON_NULLPTR(_biases->buffer());
     ARM_COMPUTE_ERROR_ON_NULLPTR(_output_workspace);
     ARM_COMPUTE_ERROR_ON_NULLPTR(_output);
 
     OutputTransform output_transform(_output_workspace, _matrix_stride, _matrix_row_stride,
-                                     reinterpret_cast<T *>(_biases->buffer()), _output,
+                                     (_biases ? reinterpret_cast<T *>(_biases->buffer()) : nullptr), _output,
                                      _n_batches, _n_rows, _n_cols, _n_channels);
 
     // The code below cannot be moved to configure because biases hasn't been allocated at that point