fix: guard against empty YAML and missing proxy name in expander

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/tests/test_expander.py

@@ -149,3 +149,27 @@ def test_build_mihomo_config_no_providers():
     result = build_mihomo_config(["proxies: []"], "s")
     cfg = yaml.safe_load(result)
     assert "proxy-providers" not in cfg
+
+
+def test_expand_config_skips_proxies_without_name():
+    result = expand_config(BASE_YAML, {"provider1": [
+        {"type": "ss", "server": "1.2.3.4", "port": 443},  # no "name"
+        {"name": "valid-node", "type": "ss", "server": "5.6.7.8", "port": 443},
+    ]})
+    cfg = yaml.safe_load(result)
+    names = [p["name"] for p in cfg["proxies"]]
+    assert "valid-node" in names
+    assert len(names) == 1
+
+
+def test_build_mihomo_config_skips_malformed_yaml():
+    valid_yaml = """
+proxy-providers:
+  p1:
+    type: http
+    url: https://example.com/sub
+    interval: 3600
+"""
+    result = build_mihomo_config([valid_yaml, ":: invalid yaml ::: {{{"], "s")
+    cfg = yaml.safe_load(result)
+    assert "p1" in cfg["proxy-providers"]