Merge branch 'vaspparser-fix' into 'v0.10.1'

Vaspparser fix

See merge request !293

vasp @ 821e4cbe

-Subproject commit 9258f9521823698fcdfbdf85d5665d7694fafe5e
+Subproject commit 821e4cbe3186e400c8cb54f4b89704504c790349

nomad/parsing/file_parser/file_parser.py

@@ -47,7 +47,7 @@ class FileParser:
         self._results: Dict[str, Any] = None
         # a key is necessary for xml parsers, where parsing is done dynamically
         self._key: str = None
-        self._kwargs: Dict[str, Any] = None
+        self._kwargs: Dict[str, Any] = dict()
         self._file_handler: Any = None
 
     def init_parameters(self):