[scrobbles] Allow junk in the scrobble log

vrobbler/apps/scrobbles/dataclasses.py

@@ -1,6 +1,6 @@
+import inspect
 import json
-from dataclasses import dataclass, asdict
-
+from dataclasses import asdict, dataclass
 from typing import Optional
 
 
@@ -23,6 +23,16 @@ class JSONMetadata(object):
     def json(self):
         return json.dumps(self.asdict)
 
+    @classmethod
+    def from_dict(cls, env):
+        return cls(
+            **{
+                k: v
+                for k, v in env.items()
+                if k in inspect.signature(cls).parameters
+            }
+        )
+
 
 @dataclass
 class BoardGameScore(JSONMetadata):