Phabricator version: 5306fbfa7af4cdd8b326f86ed66f300c5cc22b9d
When a commit contains an ambiguous URL, the PhabricatorRepositoryCommitHeraldWorker fails to import the commit.
Steps to reproduce:
1. Start watching a repository that has a commit with an ambigous URL in the commit message such as `showcase://?ITEM_ID to showcase://item/ITEM_ID`
2. Wait for PhabricatorRepositoryCommitHeraldWorker to see the commit.
You will see a leased task for PhabricatorRepositoryCommitHeraldWorker with lots of failures. There should be log messages in `/var/log/phabricator/daemons.log` along the lines of:
```
[05-Jul-2017 11:39:03 Australia/Sydney] [2017-07-05 11:39:03] EXCEPTION: (PhutilProxyException) Error while executing Task ID 30105164. {>} (Exception) Rejecting ambiguous URI "Change the recognised url from showcase://?ITEM_ID to showcase://item/ITEM_ID where ITEMID is the ID of the showcase item". This URI is not formatted or encoded properly. at [<phutil>/src/parser/PhutilURI.php:51]
```
Clicking `View Task` and following the `data` link will show the commit with the message:
```
Still Importing...
This commit is still importing. Changes will be visible once the import finishes.
```
As for T12696, I expect the commit to be imported, but for no meaningful URL to be displayed when I view the commit.