Creating a window with empty string title causes a crash

[ritave]

Tested on OS X 10.6.8

Minimal example:

#include <SFML/Window.hpp>

int main()
{
    sf::Window w(sf::VideoMode(100,100),"");
}

The error is:

malloc: *** error for object 0x100074360: pointer being freed was not allocated

and happens in sf::String destructor as backtrace from gdb is as follows:

#0  0x00007fff889990b6 in __kill ()
#1  0x00007fff88a399f6 in abort ()
#2  0x00007fff88951195 in free ()
#3  0x0000000100001765 in __gnu_cxx::new_allocator<char>::deallocate (this=0x7fff5fbff68f, __p=0x100074360 "") at new_allocator.h:97
#4  0x00000001000017b1 in std::basic_string<unsigned int, std::char_traits<unsigned int>, std::allocator<unsigned int> >::_Rep::_M_destroy (this=0x100074360, __a=@0x7fff5fbff6ef) at basic_string.tcc:431
#5  0x0000000100001813 in std::basic_string<unsigned int, std::char_traits<unsigned int>, std::allocator<unsigned int> >::_Rep::_M_dispose (this=0x100074360, __a=@0x7fff5fbff6ef) at basic_string.h:238
#6  0x0000000100001844 in std::basic_string<unsigned int, std::char_traits<unsigned int>, std::allocator<unsigned int> >::~basic_string (this=0x7fff5fbff7a0) at basic_string.h:493
#7  0x000000010000186d in sf::String::~String (this=0x7fff5fbff7a0) at String.hpp:44
#8  0x0000000100001528 in main () at temp.cpp:5

[mantognini]

See #5 and #384.