Removed stupid todo assert.

3rdparty/stb/stb_truetype.h

@@ -1576,8 +1576,7 @@ STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codep
       }
       return 0; // not found
    }
-   // @TODO
-   STBTT_assert(0);
+
    return 0;
 }