Update the remainder of the unit tests to handle throw_on_error, make parser not set error if all lines are empty

include/ss/parser.hpp

@@ -38,10 +38,6 @@ public:
         : file_name_{file_name}, reader_{file_name_, delim} {
         if (reader_.file_) {
             read_line();
-            if (eof_) {
-                handle_error_eof_reached();
-                return;
-            }
             if constexpr (ignore_header) {
                 ignore_next();
             } else {