Fix two minor issues

Summary:
Ref T7811. Fixes two minor issues I observed in the cluster:

  - Sometimes APC doesn't give us key names. Not sure exactly what's up here, but we can do a better job with this.
  - The `%` in `25%` actually needs more escaping, since it's interpreted by both `pht()` (immediately) and `console_format()` (later).

Test Plan:
  - First one is just from an error log, not sure how to repro offhand.
  - Ran `bin/phd help start` for the second one.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T7814, T7811

Differential Revision: https://secure.phabricator.com/D12395

Author: epriestley

src/applications/cache/spec/PhabricatorDataCacheSpec.php

@@ -83,7 +83,8 @@ private function initAPCCommonSpec() {
     $cache = $info['cache_list'];
     $state = array();
     foreach ($cache as $item) {
-      $key = self::getKeyPattern($item['info']);
+      $info = idx($item, 'info', '<unknown-key>');
+      $key = self::getKeyPattern($info);
       if (empty($state[$key])) {
         $state[$key] = array(
           'max' => 0,

src/applications/daemon/management/PhabricatorDaemonManagementWorkflow.php

@@ -619,7 +619,7 @@ protected function getAutoscaleReserveArgument() {
         'Specify a proportion of machine memory which must be free '.
         'before autoscale pools will grow. For example, a value of 0.25 '.
         'means that pools will not grow unless the machine has at least '.
-        '25%% of its RAM free.'),
+        '25%%%% of its RAM free.'),
     );
   }