metadata handling fix

src/dexorder/configuration/schema.py

@@ -34,4 +34,4 @@ class Config:
     mirror_source_rpc_url: Optional[str] = None  # source RPC for original pools
     mirror_env: Optional[str] = None
     mirror_pools: list[str] = field(default_factory=list)
-    metadata: Optional[str] = field(default='metadata.json')
+    metadata: Optional[str] = None

src/dexorder/metadata.py

@@ -135,8 +135,13 @@ def get_metadata(addr=None, *, chain_id=None):
         if config.metadata is None or generating_metadata:
             metadata = None
         else:
+            try:
                 with open(config.metadata) as file:
                     metadata = json.load(file)
+            except FileNotFoundError:
+                log.warning(f'No metadata file at {config.metadata}')
+                metadata = None
+            else:
                 for chain_id, chain_info in metadata.items():
                     chain_id = int(chain_id)
                     for t in chain_info['t']: