[quant_tensor] Updated div behaviour to throw RuntimeError when non-z…

…ero zero-point operands are used

src/brevitas/quant_tensor/__init__.py

@@ -415,7 +415,7 @@ def __truediv__(self, other):
             if self.is_zero_zero_point(self) and self.is_zero_zero_point(other):
                 output_zero_point = self.zero_point * other.zero_point  # Output zero_point is a new, zero-valued tensor
             else:
-                output_zero_point = None  # TODO non-zero zero point
+                raise RuntimeError("Zero-points of div operands are non-zero, not supported.")
             output = QuantTensor(
                 value=output_tensor,
                 scale=output_scale,