code: public Optional<StandardField> maybeGetStandardFieldEntry(
  			StandardFieldEntryKey key) {
  		return Optional.fromNullable(standardFields.get(key));
  	}
docs: Returns maybe the standard field entry for the given key.
  
  If the file is a PE32+, it will not have a base of data field and return
  absent for the base of data key.
  
  @param key the key of the standard field
  @return the standard field entry for the given key