Ignore warning for empty hbm2ddl.auto since it's a valid option

gemma-core/src/main/resources/ubic/gemma/applicationContext-hibernate.xml

@@ -67,6 +67,7 @@
 				<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
 				<prop key="hibernate.cache.query_cache_factory">org.hibernate.cache.StandardQueryCacheFactory</prop>
 				<!-- <prop key="hibernate.cache.region.factory_class">net.sf.ehcache.hibernate.EhCacheRegionFactory</prop> -->
+				<!--suppress SpringXmlModelInspection -->
 				<prop key="hibernate.hbm2ddl.auto">${gemma.hibernate.hbm2ddl.auto}</prop>
 				<prop key="hibernate.max_fetch_depth">${gemma.hibernate.max_fetch_depth}</prop>
 				<prop key="hibernate.jdbc.fetch_size">${gemma.hibernate.jdbc_fetch_size}</prop>