fix: logic error in url retrieval

.gitignore

@@ -165,3 +165,4 @@ mapping/*# pixi environments
 .pixi
 
 .vscode/
+.DS_store

src/rattler_build_conda_compat/recipe_sources.py

@@ -43,7 +43,7 @@ def get_all_url_sources(recipe: Mapping[Any, Any]) -> Iterator[str]:
         sources = output.get("source", None)
         sources = typing.cast(ConditionalList[Source], sources)
         if sources is None:
-            return
+            continue
         sources = visit_conditional_list(sources, None)
         for source in sources:
             if "url" in source:

tests/data/outputs_source.yaml

@@ -1,11 +1,14 @@
 outputs:
-  source:
-    - if: foo
-      then:
-        - url: https://foo.com
-    - if: bla
-      then:
-        - url: https://bar.com
-      else:
-        - url: https://baz.com
-    - url: https://qux.com
+  - package:
+      name: foo
+      version: 1.0.0
+  - source:
+      - if: foo
+        then:
+          - url: https://foo.com
+      - if: bla
+        then:
+          - url: https://bar.com
+        else:
+          - url: https://baz.com
+      - url: https://qux.com