docs: def dir_import_table(self):
          """
              import table is terminated by a all-null entry, so we have to
              check for that
          """
          import_header = list(self.optional_data_directories)[1]
          import_offset = self.resolve_rva(import_header.VirtualAddress)
  
          i = 0
          while True:
              offset = import_offset + i*Import_DirectoryTable.get_size()
              idt = Import_DirectoryTable(self.stream, offset, self)
  
              if idt.is_empty():
                  break
              else:
                  yield idt
  
              i += 1