message: Don't return 0-byte BlockShape for error case
  * This can lead to divide-by-zero errors, instead return 1x1 1 byte block as a
  relatively sane default.
diff: @@ -1543,7 +1543,7 @@ BlockShape GetBlockShape(VkFormat Format, uint32_t plane)
  default: RDCERR("Unrecognised Vulkan Format: %d", Format);
  }
  - return BlockShape();
  + return {1, 1, 1};
  }
  VkExtent2D GetPlaneShape(uint32_t Width, uint32_t Height, VkFormat Format, uint32_t plane)
  