Keep the 'module_name:[]' in requires unexpanded in generate_expanded_mmds.

module_build_service/utils/mse.py

@@ -279,7 +279,7 @@ def generate_expanded_mmds(session, mmd, raise_if_stream_ambigous=False, default
         # Each generated MMD must be new Module object...
         # TODO: Use copy method once its in released libmodulemd:
         # https://github.com/fedora-modularity/libmodulemd/pull/20
-        mmd_copy = Modulemd.Module.new_from_string(current_mmd.dumps())
+        mmd_copy = Modulemd.Module.new_from_string(mmd.dumps())
         xmd = glib.from_variant_dict(mmd_copy.get_xmd())
 
         # Requires contain the NSVC representing the input mmd.

tests/test_utils/test_utils_mse.py

@@ -213,6 +213,14 @@ class TestUtilsModuleStreamExpansion:
              set([
                  frozenset(['gtk:1'])
              ])),
+
+            ({"gtk": []}, {"gtk": ["1"]}, True,
+             set([
+                 frozenset(['gtk:1:0:c2', 'platform:f28:0:c10'])
+             ]),
+             set([
+                 frozenset(['gtk:1'])
+             ])),
         ])
     def test_generate_expanded_mmds_buildrequires(
             self, requires, build_requires, stream_ambigous, expected_xmd,
@@ -293,6 +301,11 @@ class TestUtilsModuleStreamExpansion:
              frozenset(['foo:1', 'gtk:1']),
          ])),
 
+        ({"gtk": [], "foo": []}, {"gtk": ["1"], "foo": ["1"]},
+         set([
+             frozenset([]),
+         ])),
+
     ])
     def test_generate_expanded_mmds_requires(self, requires, build_requires, expected):
         self._generate_default_modules()