Add missing space to exception message for Prolog rule error

If an error occurs while executing a Prolog rule we now fail with

com.google.gerrit.exceptions.StorageException: Submit type rule failed: RULE_ERROR (Error evaluating project rules, check server log)

instead of

com.google.gerrit.exceptions.StorageException: Submit type rule failed: RULE_ERROR(Error evaluating project rules, check server log)

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: Ic5947f83675c837717dd2ea59ace2590ee63b35b
diff --git a/java/com/google/gerrit/common/data/SubmitTypeRecord.java b/java/com/google/gerrit/common/data/SubmitTypeRecord.java
index d16da96..afb3bac 100644
--- a/java/com/google/gerrit/common/data/SubmitTypeRecord.java
+++ b/java/com/google/gerrit/common/data/SubmitTypeRecord.java
@@ -65,7 +65,7 @@
     StringBuilder sb = new StringBuilder();
     sb.append(status);
     if (status == Status.RULE_ERROR && errorMessage != null) {
-      sb.append('(').append(errorMessage).append(")");
+      sb.append(" (").append(errorMessage).append(")");
     }
     if (type != null) {
       sb.append('[');