core (memory/cache): don't crash on EOFError in getMetadata

sat/memory/cache.py

@@ -140,7 +140,7 @@ class Cache(object):
         try:
             with cache_url.open("rb") as f:
                 cache_data = pickle.load(f)
-        except IOError as e:
+        except (IOError, EOFError) as e:
             log.warning(f"can't read cache at {cache_url}: {e}")
             return None
         except pickle.UnpicklingError: