Merge pull request #230 from SanyaSho/patch/null-sprite-crash

Add missing NULL check from original MP branch

game/client/spritemodel.cpp

@@ -417,6 +417,9 @@ IMaterial *CEngineSprite::GetMaterial( RenderMode_t nRenderMode, int nFrame )
 	
 	
 	IMaterial *pMaterial = m_material[nRenderMode];
+	if( !pMaterial )
+		return NULL;
+
 	IMaterialVar* pFrameVar = pMaterial->FindVarFast( "$frame", &frameCache );
 	if ( pFrameVar )
 	{
@@ -539,4 +542,4 @@ void CEngineSprite::DrawFrameOfSize( RenderMode_t nRenderMode, int frame, int x,
 
 	meshBuilder.End();
 	pMesh->Draw();
-}
+}