Description of problem:

If user hits the "Next" button on page 1 of the BCW, after selecting URL but not populating this field with an appropriate value, an NPE is returned in UI.


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. Administration > Content > Bundles > New
2. Click the "URL" radio button; enter nothing in the field.
3. Hit Next:
  
Actual results:
Error message: "java.net.MalformedURLException:null -> java.lang.NullPointerException:null"

Expected results:
Can't we capture this somehow and enter a user-friendly message -- despite how obvious the error was?


Additional info:
A similar message appears if user submits a blank Recipe, but it is not an NPE.

javax.ejb.EJBException:java.lang.IllegalArgumentException: recipe == null -> java.lang.IllegalArgumentException:recipe == null