Show project name that failed migration to Schema-131

When migrating to schema 131, all the projects get scanned and
migrated. Some of them may have problems (e.g. Git inconsistencies)
and need to be highlighted so that can be analysed and recovered.

Change-Id: I9e6ceb688809dbd29be25373494b38db86f4976f
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/schema/Schema_131.java b/gerrit-server/src/main/java/com/google/gerrit/server/schema/Schema_131.java
index 1be4c3e..a2ba03c 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/schema/Schema_131.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/schema/Schema_131.java
@@ -61,7 +61,7 @@
           config.commit(md);
         }
       } catch (ConfigInvalidException | IOException ex) {
-        throw new OrmException(ex);
+        throw new OrmException("Cannot migrate project " + projectName, ex);
       }
     }
   }