reorganize modules

src/framework/graphics/font.cpp

@@ -76,7 +76,7 @@ void Font::renderText(const std::string& text,
                       const Color& color)
 {
     // prevent glitches from invalid rects
-    if(!screenCoords.isValid())
+    if(!screenCoords.isValid() || !m_texture)
         return;
 
     int textLenght = text.length();

src/framework/graphics/fontmanager.cpp

@@ -27,6 +27,11 @@
 
 FontManager g_fonts;
 
+FontManager::FontManager()
+{
+    m_defaultFont = FontPtr(new Font("emptyfont"));
+}
+
 void FontManager::releaseFonts()
 {
     m_defaultFont.reset();

src/framework/graphics/fontmanager.h

@@ -28,6 +28,8 @@
 class FontManager
 {
 public:
+    FontManager();
+
     /// Release fonts references, thus making possible to destruct them
     void releaseFonts();