Update Changelog, another small MD3 fix

Changelog.md

@@ -4,6 +4,22 @@ dhewm3 Changelog
 Note: Numbers starting with a "#" like #330 refer to the bugreport with that number
       at https://github.com/dhewm/dhewm3/issues/
 
+1.5.3 (WIP)
+------------------------------------------------------------------------
+
+* Fixed problems with lights after loading a savegame (#495)
+* Fix volume of some weapon sounds, like chaingun being too quit (#326)
+* Increase stack size on Windows to 8MB (instead default of 1MB) to make loading huge models work
+* Fixed crash in Radiant Model Preview Dialog (#496)
+* Fix MD3 model support
+* Several new CMake options:
+    - To enable Clang/GCC Address Sanitizer and Undefined Behavior Sanitizer
+    - Hardlink the game code into the executable (instead of using game DLLs,
+      only supports base *or* d3xp then; needed for Undefined Behavior Sanitizer)
+    - Force colored diagnostic output from GCC or Clang (esp. useful when building with ninja)
+* Fix several compiler warnings
+* Added build instructions for Linux (and similar systems) to README.md
+
 1.5.2 (2022-06-13)
 ------------------------------------------------------------------------
 

neo/renderer/Model_md3.cpp

@@ -172,7 +172,7 @@ void idRenderModelMD3::InitFromFile( const char *fileName ) {
 			const idMaterial *sh = declManager->FindMaterial( shader->name );
 			// DG: md3Shadder_t must use an index to the material instead of a pointer,
 			//     otherwise the sizes are wrong on 64bit and we get data corruption
-			shader->shaderIndex = shaders.AddUnique( sh );
+			shader->shaderIndex = (sh != NULL) ? shaders.AddUnique( sh ) : -1;
 		}
 
 		// swap all the triangles