Vulkan: Add better handling for errors

src/Nazara/Renderer/Renderer.cpp

@@ -83,6 +83,12 @@ namespace Nz
 			}
 		}
 
+		if (!chosenImpl)
+		{
+			NazaraError("No renderer found");
+			return false;
+		}
+
 		s_rendererImpl = std::move(chosenImpl);
 		s_rendererLib = std::move(chosenLib);
 

src/Nazara/VulkanRenderer/Vulkan.cpp

@@ -174,7 +174,7 @@ namespace Nz
 
 		if (!s_instance.Create(instanceInfo))
 		{
-			NazaraError("Failed to create instance");
+			NazaraError("Failed to create instance: " + TranslateVulkanError(s_instance.GetLastErrorCode()));
 			return false;
 		}