Add missing space to "Cannot scan repositories" message

Change-Id: I7585d0480c0f0a4f8082203a9f04a980493ea447

gitiles-servlet/src/main/java/com/google/gitiles/HostIndexServlet.java

diff --git a/gitiles-servlet/src/main/java/com/google/gitiles/HostIndexServlet.java b/gitiles-servlet/src/main/java/com/google/gitiles/HostIndexServlet.java
index 84cfdb2..db563ff 100644
--- a/gitiles-servlet/src/main/java/com/google/gitiles/HostIndexServlet.java
+++ b/gitiles-servlet/src/main/java/com/google/gitiles/HostIndexServlet.java
@@ -83,7 +83,7 @@
       return null;
     } catch (IOException err) {
       String name = urls.getHostName(req);
-      log.warn("Cannot scan repositories" + (name != null ? "for " + name : ""), err);
+      log.warn("Cannot scan repositories" + (name != null ? " for " + name : ""), err);
       res.sendError(SC_SERVICE_UNAVAILABLE);
       return null;
     }