Fixed racing problem

Signed-off-by: Andreas Pieber <anpieber@gmail.com>

git-svn-id: https://svn.apache.org/repos/asf/karaf/sandbox/pieber/karaf-webconsole/trunk@1159538 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/core/src/main/resources/OSGI-INF/blueprint/core.xml b/core/src/main/resources/OSGI-INF/blueprint/core.xml
index e951bb9..c24ea10 100644
--- a/core/src/main/resources/OSGI-INF/blueprint/core.xml
+++ b/core/src/main/resources/OSGI-INF/blueprint/core.xml
@@ -22,6 +22,7 @@
         <bean class="org.apache.karaf.webconsole.core.brand.DefaultBrandProvider" />
     </service>
 
-    <reference id="brandProvider" interface="org.apache.karaf.webconsole.core.brand.BrandProvider" />
+    <reference id="brandProvider" interface="org.apache.karaf.webconsole.core.brand.BrandProvider" 
+	availability="optional" />
 
 </blueprint>