Found a null return from the provider, replaced with an ItemNotFoundE…

…xception which is much easier to handle downstream.

java/dd4t-providers/src/main/java/org/dd4t/providers/impl/BrokerComponentProvider.java

@@ -85,8 +85,8 @@ public ComponentPresentation getDynamicComponentPresentation(
 			if (cp == null) {
 				logger.debug("component presentation NOT found by template");
 
-				// no cp found, and they asked for a template, means we return null
-				return null;
+				// no cp found, and they asked for a template, means we have to throw an exception
+				throw new ItemNotFoundException("Unable to find DCP by template for pub "+publicationId+", item "+componentId+" and template "+templateId);	
 			}
 
 			logger.debug("component presentation found by template. ");