diff --git a/core/modules/rdf/lib/Drupal/rdf/Tests/GetRdfNamespacesTest.php b/core/modules/rdf/lib/Drupal/rdf/Tests/GetRdfNamespacesTest.php
index ab90257..db9ef14 100644
--- a/core/modules/rdf/lib/Drupal/rdf/Tests/GetRdfNamespacesTest.php
+++ b/core/modules/rdf/lib/Drupal/rdf/Tests/GetRdfNamespacesTest.php
@@ -45,10 +45,10 @@ function testGetRdfNamespaces() {
     \Drupal::moduleHandler()->install(array('rdf_conflicting_namespaces'), TRUE);
     try {
       $ns = rdf_get_namespaces();
-      $this->fail(t('Expected exception not thrown for conflicting namespace declaration.'));
+      $this->fail('Expected exception not thrown for conflicting namespace declaration.');
     }
     catch (\Exception $e) {
-      $this->pass(t('Expected exception thrown: @message', array('@message' => $e->getMessage())));
+      $this->pass('Expected exception thrown: ' . $e->getMessage());
     }
   }
 }
diff --git a/core/modules/rdf/rdf.module b/core/modules/rdf/rdf.module
index 680731b..f0f33f5 100644
--- a/core/modules/rdf/rdf.module
+++ b/core/modules/rdf/rdf.module
@@ -112,14 +112,12 @@ function rdf_get_namespaces() {
   // namespace, do not use \Drupal::moduleHandler()->invokeAll().
   foreach (\Drupal::moduleHandler()->getImplementations('rdf_namespaces') as $module) {
     $function = $module . '_rdf_namespaces';
-    if (function_exists($function)) {
-      foreach($function() as $prefix => $namespace) {
-        if (array_key_exists($prefix, $namespaces) && $namespace !== $namespaces[$prefix]) {
-          throw new Exception(t('Tried to map @prefix to @namespace, but @prefix is already mapped to @orig_namespace.', array('@prefix' => $prefix, '@namespace' => $namespace, '@orig_namespace' => $namespaces[$prefix])));
-        }
-        else {
-          $namespaces[$prefix] = $namespace;
-        }
+    foreach($function() as $prefix => $namespace) {
+      if (array_key_exists($prefix, $namespaces) && $namespace !== $namespaces[$prefix]) {
+        throw new Exception(t('Tried to map @prefix to @namespace, but @prefix is already mapped to @orig_namespace.', array('@prefix' => $prefix, '@namespace' => $namespace, '@orig_namespace' => $namespaces[$prefix])));
+      }
+      else {
+        $namespaces[$prefix] = $namespace;
       }
     }
   }
diff --git a/core/modules/rdf/tests/rdf_conflicting_namespaces/rdf_conflicting_namespaces.module b/core/modules/rdf/tests/rdf_conflicting_namespaces/rdf_conflicting_namespaces.module
index 97d0e18..2fbdba4 100644
--- a/core/modules/rdf/tests/rdf_conflicting_namespaces/rdf_conflicting_namespaces.module
+++ b/core/modules/rdf/tests/rdf_conflicting_namespaces/rdf_conflicting_namespaces.module
@@ -10,6 +10,6 @@
  */
 function rdf_conflicting_namespaces_rdf_namespaces() {
   return array(
-    'dc'       => 'http://purl.org/conflicting/namespace',
+    'dc' => 'http://purl.org/conflicting/namespace',
   );
 }