<encounterDiagnoses></encounterDiagnoses> after <obsGroup></obsGroup> with empty obs throws validation error

1. Environment

• Ref App 2.9
• Core Apps 1.22.0
• Core 2.2

2. Steps to reproduce

Stacking <encounterDiagnoses/> together with <obsgroup/> with a use case such as shown below throws ValidationException when used with OpenMRS Core 2.2.x and form submitted with empty values for the obs group members. An example form to reproduce this is in the attachments section.

<htmlform>	
     .......
     <obsgroup groupingConceptId=....>		
          <obs conceptId=..../> 
          .......
          .......	
     </obsgroup>
     ......	
     <encounterDiagnoses/>	
</htmlform>

 3. Proposed solution

<encounterDiagnoses/> submission handler should delegate to 

HtmlFormEntryService.applyActions()

 when saving an encounter to take care of empty obs.

 An example with failing test can be found here.