[ktx2] Running toktx with no arguments triggers a segmentation fault about ktx-software HOT 3 CLOSED

(gdb) bt
#0  __memmove_avx_unaligned_erms () at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:238
#1  0x00007fffff508ae5 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_assign(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#2  0x0000000008015af9 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::assign (__str=...,
    this=0x7ffffffee0d8) at /usr/include/c++/9/bits/basic_string.h:1364
#3  std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator= (__str=..., this=0x7ffffffee0d8)
    at /usr/include/c++/9/bits/basic_string.h:696
#4  processCommandLine (argc=1, argv=0x7ffffffee458, options=...) at /mnt/c/work/KTX-Software/tools/toktx/toktx.cpp:1169
#5  0x0000000008016139 in main (argc=1, argv=0x7ffffffee458) at /mnt/c/work/KTX-Software/tools/toktx/toktx.cpp:590

    options.outfile = parser.argv[i++];