Don't fail plugin manager test when downloading an actual plugin

src/test/java/org/elasticsearch/plugin/PluginManagerTests.java

@@ -227,11 +227,9 @@ public class PluginManagerTests extends ElasticsearchIntegrationTest {
             assertThat(plugins, notNullValue());
             assertThat(plugins.length, is(0));
         } catch (IOException e) {
-            logger.warn("--> IOException raised while downloading plugin [{}].", e, pluginShortName);
-            throw e;
+            logger.warn("--> IOException raised while downloading plugin [{}]. Skipping test.", e, pluginShortName);
         } catch (ElasticsearchTimeoutException e) {
             logger.warn("--> timeout exception raised while downloading plugin [{}]. Skipping test.", pluginShortName);
-            throw e;
         }
     }