Schema: Show only a single log for inexistent commits
Schema: Show only a single log for inexistent commits

Producing 16 logs for each commit is pointless.

Finding a StorageException means we're going to hit exceptions again
and again for each field, so bubble them up and return an empty list
when we find one.

Example:
[2020-06-07T13:28:28.346+0300] [Index-Batch-1] ERROR com.google.gerrit.index.Schema : error getting field added of ChangeData{Change{777 (Ia3439cd1765c9a7a08a07a1485fbc95aabd8cf56), dest=Project,refs/heads/master, status=M}}
com.google.gerrit.exceptions.StorageException: Loading commit AnyObjectId[cee21a4ec8b5ae2469f7f314c2548dedc1023293] for ps 2 of change 777 failed.
	at com.google.gerrit.server.query.change.ChangeData.loadCommitData(ChangeData.java:596)
	at com.google.gerrit.server.query.change.ChangeData.getDiffSummary(ChangeData.java:398)
	at com.google.gerrit.server.query.change.ChangeData.computeChangedLines(ChangeData.java:414)
[2020-06-07T13:28:28.352+0300] [Index-Batch-1] ERROR com.google.gerrit.index.Schema : error getting field author of ChangeData{Change{777 (Ia3439cd1765c9a7a08a07a1485fbc95aabd8cf56), dest=Project,refs/heads/master, status=M}}
[2020-06-07T13:28:28.355+0300] [Index-Batch-1] ERROR com.google.gerrit.index.Schema : error getting field committer of ChangeData{Change{777 (Ia3439cd1765c9a7a08a07a1485fbc95aabd8cf56), dest=Project,refs/heads/master, status=M}}
[2020-06-07T13:28:28.357+0300] [Index-Batch-1] ERROR com.google.gerrit.index.Schema : error getting field message of ChangeData{Change{777 (Ia3439cd1765c9a7a08a07a1485fbc95aabd8cf56), dest=Project,refs/heads/master, status=M}}
[2020-06-07T13:28:28.358+0300] [Index-Batch-1] ERROR com.google.gerrit.index.Schema : error getting field deleted of ChangeData{Change{777 (Ia3439cd1765c9a7a08a07a1485fbc95aabd8cf56), dest=Project,refs/heads/master, status=M}}
[2020-06-07T13:28:28.360+0300] [Index-Batch-1] ERROR com.google.gerrit.index.Schema : error getting field delta of ChangeData{Change{777 (Ia3439cd1765c9a7a08a07a1485fbc95aabd8cf56), dest=Project,refs/heads/master, status=M}}
[2020-06-07T13:28:28.361+0300] [Index-Batch-1] ERROR com.google.gerrit.index.Schema : error getting field directory of ChangeData{Change{777 (Ia3439cd1765c9a7a08a07a1485fbc95aabd8cf56), dest=Project,refs/heads/master, status=M}}
[2020-06-07T13:28:28.364+0300] [Index-Batch-1] ERROR com.google.gerrit.index.Schema : error getting field exactauthor of ChangeData{Change{777 (Ia3439cd1765c9a7a08a07a1485fbc95aabd8cf56), dest=Project,refs/heads/master, status=M}}
[2020-06-07T13:28:28.365+0300] [Index-Batch-1] ERROR com.google.gerrit.index.Schema : error getting field exactcommitter of ChangeData{Change{777 (Ia3439cd1765c9a7a08a07a1485fbc95aabd8cf56), dest=Project,refs/heads/master, status=M}}
[2020-06-07T13:28:28.367+0300] [Index-Batch-1] ERROR com.google.gerrit.index.Schema : error getting field extension of ChangeData{Change{777 (Ia3439cd1765c9a7a08a07a1485fbc95aabd8cf56), dest=Project,refs/heads/master, status=M}}
[2020-06-07T13:28:28.375+0300] [Index-Batch-1] ERROR com.google.gerrit.index.Schema : error getting field filepart of ChangeData{Change{777 (Ia3439cd1765c9a7a08a07a1485fbc95aabd8cf56), dest=Project,refs/heads/master, status=M}}
[2020-06-07T13:28:28.377+0300] [Index-Batch-1] ERROR com.google.gerrit.index.Schema : error getting field footer of ChangeData{Change{777 (Ia3439cd1765c9a7a08a07a1485fbc95aabd8cf56), dest=Project,refs/heads/master, status=M}}
[2020-06-07T13:28:28.379+0300] [Index-Batch-1] ERROR com.google.gerrit.index.Schema : error getting field onlyextensions of ChangeData{Change{777 (Ia3439cd1765c9a7a08a07a1485fbc95aabd8cf56), dest=Project,refs/heads/master, status=M}}
[2020-06-07T13:28:28.380+0300] [Index-Batch-1] ERROR com.google.gerrit.index.Schema : error getting field file of ChangeData{Change{777 (Ia3439cd1765c9a7a08a07a1485fbc95aabd8cf56), dest=Project,refs/heads/master, status=M}}
[2020-06-07T13:28:28.388+0300] [Index-Batch-1] ERROR com.google.gerrit.index.Schema : error getting field tr of ChangeData{Change{777 (Ia3439cd1765c9a7a08a07a1485fbc95aabd8cf56), dest=Project,refs/heads/master, status=M}}
[2020-06-07T13:28:28.390+0300] [Index-Batch-1] ERROR com.google.gerrit.index.Schema : error getting field merge of ChangeData{Change{777 (Ia3439cd1765c9a7a08a07a1485fbc95aabd8cf56), dest=Project,refs/heads/master, status=M}}

Change-Id: If23916d20134c869999d2588316936f29b0701db

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