Fix: Response was processed even in case of error status code

Solution: Call `raise_for_status` before parsing and returning the response data.

src/aleph/services/ipfs/service.py

@@ -162,6 +162,7 @@ async def add_file(self, fileobject: IO):
             data.add_field("path", fileobject)
 
             resp = await session.post(url, data=data)
+            resp.raise_for_status()
             return await resp.json()
 
     async def sub(self, topic: str):