Only warn for possible undeleted opengl stuff when debug build

Happens when you press close button in stk window.

src/graphics/shader_files_manager.hpp

@@ -21,6 +21,7 @@
 #define HEADER_SHADER_FILES_MANAGER_HPP
 
 #include "graphics/gl_headers.hpp"
+#include "utils/log.hpp"
 #include "utils/no_copy.hpp"
 #include "utils/singleton.hpp"
 
@@ -60,7 +61,13 @@ public:
     void removeAllShaderFiles()
     {
         removeUnusedShaderFiles();
-        assert(m_shader_files_loaded.empty());
+        if (!m_shader_files_loaded.empty())
+        {
+#ifdef DEBUG
+            Log::error("ShaderFilesManager", "Some shader file > 1 ref_count");
+#endif
+            m_shader_files_loaded.clear();
+        }
     }
     // ------------------------------------------------------------------------
     void removeUnusedShaderFiles()

src/graphics/sp/sp_shader_manager.cpp

@@ -139,10 +139,12 @@ SPShaderManager::~SPShaderManager()
 {
     m_official_shaders.clear();
     removeUnusedShaders();
+#ifdef DEBUG
     for (auto p : m_shaders)
     {
         Log::error("SPShaderManager", "%s > 1 ref_count", p.first.c_str());
     }
+#endif
 }   // ~SPShaderManager
 
 // ----------------------------------------------------------------------------

src/graphics/sp/sp_texture_manager.cpp

@@ -89,10 +89,12 @@ SPTextureManager::~SPTextureManager()
     }
     m_threaded_load_obj.clear();
     removeUnusedTextures();
+#ifdef DEBUG
     for (auto p : m_textures)
     {
         Log::error("SPTextureManager", "%s > 1 ref_count", p.first.c_str());
     }
+#endif
 }   // ~SPTextureManager
 
 // ----------------------------------------------------------------------------