Added error message if a user tries to promote non existent inputs/ou…

…tputs
OpenMDAO · Oct 23, 2019 · a88e184 · a88e184
1 parent c89d6b2
commit a88e184
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diff --git a/openmdao/core/system.py b/openmdao/core/system.py
@@ -2020,6 +2020,10 @@ def resolve(to_match, io_types, matches, proms):
                             pmap[name] = gname + name if gname else name
 
             not_found = (set(names).union(renames).union(patterns)) - found
+            if self._var_promotes['any']:
+                if not self._var_abs2meta and isinstance(self, openmdao.core.group.Group):
+                    raise RuntimeError('No inputs or outputs found. Check %s '
+                                       'to make sure it is not empty' % (self.msginfo))
             if not_found:
                 if len(io_types) == 2:
                     call = 'promotes'

diff --git a/openmdao/core/tests/test_group.py b/openmdao/core/tests/test_group.py
@@ -687,6 +687,16 @@ def test_promote_not_found3(self):
                          "ExecComp (C2): 'promotes' failed to find any matches for "
                          "the following names or patterns: ['xx'].")
 
+    def test_empty_group(self):
+        p = om.Problem()
+        g1 = p.model.add_subsystem('G1', om.Group(), promotes=['*'])
+
+        with self.assertRaises(Exception) as context:
+            p.setup()
+        self.assertEqual(str(context.exception),
+                         "No inputs or outputs found. Check Group (G1) "
+                         "to make sure it is not empty")
+
     def test_missing_promote_var(self):
         p = om.Problem()