Fix searching for commits

Summary:
fix two issues. First is that the field in the query is not
correct; the other is to make indexing handle deleted repository.

Test Plan: indexed some commits and the search result looks correct.
Reviewed By: epriestley
Reviewers: epriestley, tuomaspelkonen
CC: aran, epriestley
Differential Revision: 633

src/applications/phid/handle/data/PhabricatorObjectHandleData.php

@@ -52,7 +52,7 @@ class PhabricatorObjectHandleData {
           if ($commits) {
             $data_dao = newv('PhabricatorRepositoryCommitData', array());
             $commit_data = $data_dao->loadAllWhere(
-              'id IN (%Ld)',
+              'commitID IN (%Ld)',
               mpull($commits, 'getID'));
             $commit_data = mpull($commit_data, null, 'getCommitID');
           }

src/applications/search/index/indexer/repository/PhabricatorSearchCommitIndexer.php

@@ -31,6 +31,10 @@ class PhabricatorSearchCommitIndexer
       'id = %d',
       $commit->getRepositoryID());
 
+    if (!$repository) {
+      return;
+    }
+
     $title = 'r'.$repository->getCallsign().$commit->getCommitIdentifier().
       " ".$commit_data->getSummary();