Backends: Vulkan: ImGui_ImplVulkan_AddTexture() skips updating descriptor_set if failing to allocate. (#8677)

Reduce error surface to the check_vk_result() call.

backends/imgui_impl_vulkan.cpp

diff --git a/backends/imgui_impl_vulkan.cpp b/backends/imgui_impl_vulkan.cpp
index 7bfd48a..1b4e81c 100644
--- a/backends/imgui_impl_vulkan.cpp
+++ b/backends/imgui_impl_vulkan.cpp
@@ -1376,6 +1376,7 @@
     }
 
     // Update the Descriptor Set:
+    if (descriptor_set != VK_NULL_HANDLE)
     {
         VkDescriptorImageInfo desc_image[1] = {};
         desc_image[0].sampler = sampler;

docs/CHANGELOG.txt

diff --git a/docs/CHANGELOG.txt b/docs/CHANGELOG.txt
index 176b7e6..43a7f78 100644
--- a/docs/CHANGELOG.txt
+++ b/docs/CHANGELOG.txt
@@ -107,6 +107,8 @@
     - hidden scrollbar in Firefox.
   - Vulkan: added ImGui_ImplVulkan_PipelineInfo::ExtraDynamicStates[] to allow specifying
     extra dynamic states to add when creating the VkPipeline. (#9211) [@DziubanMaciej]
+  - Vulkan: ImGui_ImplVulkan_AddTexture() skips updating descriptor_set if failing
+    to allocate one. (#8677) [@micb25]
   - WebGPU: fixed undefined behaviors in example code for requesting adapter
     and device. (#9246, #9256) [@r-lyeh]
   - GLFW/SDL2/SDL3+WebGPU: removed suport for Emscripten <4.0.10. (#9281) [@ypujante]