Better error when information is missing

[mrexodia]

   dp = Dumpulator("c:\\tmp\\dump1.dmp", trace=True)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python311\Lib\site-packages\dumpulator\dumpulator.py", line 322, in __init__
    self._setup_memory()
  File "C:\Python311\Lib\site-packages\dumpulator\dumpulator.py", line 412, in _setup_memory
    for info in self._minidump.memory_info.infos:
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'infos'

This happens if you do not specify the MiniDumpWithFullMemoryInfo