ignore empty optdepend messages

app/utils.py

@@ -147,5 +147,7 @@ def split_optdepends(deps: List[str]) -> Dict[str, Set[str]]:
             a, b = a.strip(), b.strip()
         else:
             a, b = d.strip(), ""
-        r.setdefault(a, set()).add(b)
+        e = r.setdefault(a, set())
+        if b:
+            e.add(b)
     return r

tests/test_main.py

@@ -10,6 +10,7 @@ from app import app
 from app.appstate import parse_packager
 from app.fetch import parse_cygwin_versions
 from app.pgp import parse_signature, SigError, Signature
+from app.utils import split_optdepends
 from fastapi.testclient import TestClient
 
 
@@ -118,3 +119,10 @@ def test_parse_packager():
     info = parse_packager("foobar <foobar@msys2.org>")
     assert info.name == "foobar"
     assert info.email == "foobar@msys2.org"
+
+
+def test_split_optdepends():
+    assert split_optdepends(["foo: bar"]) == {'foo': {'bar'}}
+    assert split_optdepends(["foo: bar", "foo: quux"]) == {'foo': {'bar', 'quux'}}
+    assert split_optdepends(["foobar"]) == {'foobar': set()}
+    assert split_optdepends(["foobar:"]) == {'foobar': set()}