Fixed crash when filesystem::get_relative_path was called and current path was deleted

src/filesystem.cc

@@ -202,11 +202,7 @@ boost::filesystem::path filesystem::get_canonical_path(const boost::filesystem::
 boost::filesystem::path filesystem::get_relative_path(const boost::filesystem::path &path, const boost::filesystem::path &base) noexcept {
   boost::filesystem::path relative_path;
   boost::system::error_code ec;
-#if BOOST_VERSION>=106000
-  relative_path=boost::filesystem::relative(path, base, ec);
-  if(ec)
-    return boost::filesystem::path();
-#else
+
   if(std::distance(path.begin(), path.end())<std::distance(base.begin(), base.end()))
     return boost::filesystem::path();
   
@@ -220,6 +216,6 @@ boost::filesystem::path filesystem::get_relative_path(const boost::filesystem::p
   }
   for(;path_it!=path.end();++path_it)
     relative_path/=*path_it;
-#endif
+
   return relative_path;
 }