Catch a few other possible error scenarios in Redmine user service
diff --git a/src/com/gitblit/RedmineUserService.java b/src/com/gitblit/RedmineUserService.java
index 504593f..84194d5 100644
--- a/src/com/gitblit/RedmineUserService.java
+++ b/src/com/gitblit/RedmineUserService.java
@@ -102,6 +102,11 @@
         	}

         }

         

+        if (StringUtils.isEmpty(jsonString)) {

+        	logger.error("Received empty authentication response from Redmine");

+        	return null;

+        }

+        

         RedmineCurrent current = null;

         try {

         	current = new Gson().fromJson(jsonString, RedmineCurrent.class);