fix: KeyError in EmbedMedia (#2109)

* fix `KeyError`

* Typehints and `proxy_url`

discord/embeds.py

@@ -173,16 +173,18 @@ class EmbedMedia:  # Thumbnail, Image, Video
 
     url: str
     proxy_url: str | None
-    height: int
-    width: int
+    height: int | None
+    width: int | None
 
     @classmethod
     def from_dict(cls, data: dict[str, str | int]) -> EmbedMedia:
         self = cls.__new__(cls)
         self.url = str(data.get("url"))
-        self.proxy_url = str(data.get("proxy_url"))
-        self.height = int(data["height"])
-        self.width = int(data["width"])
+        self.proxy_url = (
+            str(proxy_url) if (proxy_url := data.get("proxy_url")) else None
+        )
+        self.height = int(height) if (height := data.get("height")) else None
+        self.width = int(width) if (width := data.get("width")) else None
         return self
 
     def __repr__(self) -> str: