tdf#55502: Shell BASIC function with empty third param hangs
tdf#55502: Shell BASIC function with empty third param hangs

bt:
2  0x00002aaaab2b5226 in __assert_fail_base (fmt=0x2aaaab3ebce8 "%s%s%s:%u: %s%sAssertion `%s' failed.
%n",
    assertion=assertion@entry=0x2aaaae2ecf10 "index >= 0 && static_cast<sal_uInt32>(index) < static_cast<sal_uInt32>(getLength())",
    file=file@entry=0x2aaaae2ecec8 "/home/julien/compile-libreoffice/libreoffice/include/rtl/ustring.hxx", line=line@entry=500,
    function=function@entry=0x2aaaae2ed740 <rtl::OUString::operator[](int) const::__PRETTY_FUNCTION__> "sal_Unicode rtl::OUString::operator[](sal_Int32) const") at assert.c:92
3  0x00002aaaab2b52d2 in __GI___assert_fail (assertion=0x2aaaae2ecf10 "index >= 0 && static_cast<sal_uInt32>(index) < static_cast<sal_uInt32>(getLength())",
    file=0x2aaaae2ecec8 "/home/julien/compile-libreoffice/libreoffice/include/rtl/ustring.hxx", line=500,
    function=0x2aaaae2ed740 <rtl::OUString::operator[](int) const::__PRETTY_FUNCTION__> "sal_Unicode rtl::OUString::operator[](sal_Int32) const") at assert.c:101
4  0x00002aaaae1f44f8 in rtl::OUString::operator[] (this=0x7fffffff36b0, index=13) at /home/julien/compile-libreoffice/libreoffice/include/rtl/ustring.hxx:500
5  0x00002aaaae274036 in SbRtl_Shell (pBasic=0x3531fc0, rPar=..., bWrite=false) at /home/julien/compile-libreoffice/libreoffice/basic/source/runtime/methods.cxx:3613
Check if third param isn't empty, if not, aCmdLine finishes with a space character

Change-Id: I095b6dc7c7d2d4c826fb47aa1414c558bbc27c04

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core