[usdUtil] issue warning instead of error for ComputAllDependencies

Author: nvidia-jomiller

pxr/usd/usdUtils/dependencies.cpp

@@ -131,7 +131,7 @@ struct UsdUtils_ComputeAllDependenciesClient
             if (dependencyLayer) {
                 layers.insert(dependencyLayer);
             } else {
-                TF_RUNTIME_ERROR("Failed to open dependency layer: %s (%s)", dependency.c_str(), anchoredPath.c_str());
+                TF_WARN("Failed to open dependency layer: %s (%s)", dependency.c_str(), anchoredPath.c_str());
             }
         }
         else {

pxr/usd/usdUtils/testenv/testUsdUtilsDependencies.py

@@ -301,13 +301,16 @@ def test_ComputeAllDependenciesInvalidPayload(self):
         def TestDirPath(path):
             return os.path.normcase(
                 os.path.abspath(os.path.join(testDir, path)))
-    
+
         testDir = "computeAllDependenciesInvalidPayload"
         stagePath = "root.usda"
 
-        with self.assertRaises(Tf.ErrorException):
-            layers, assets, unresolved = \
-                UsdUtils.ComputeAllDependencies(TestDirPath(stagePath))
+        layers, references, unresolved = UsdUtils.ComputeAllDependencies(TestDirPath(stagePath))
+        self.assertEqual(len(layers), 1)
+        self.assertEqual(layers[0].identifier, TestDirPath(stagePath))
+        self.assertEqual(len(references), 0)
+        self.assertEqual(len(unresolved), 0)
+
 
 if __name__=="__main__":
     unittest.main()