XMLParser parse no empty xml tags

[rsoika]

We need to refine the method findNoEmptyTags or add a new method findNoEmptyXMLTags to ensure that in complex cases only the embedded XML is returned. This is for example need for the WorkflowKernel when testing embedded model configuration in an event.

Example

   <model>     
       <version>sub-model-1.0.0</version>
       <task>1000</task>
       <event>10</event>
    </model>

and here the embedded tag also holds the model tag!

     <imixs-micro name="CREATE">
        <endpoint>ws://workstation-1:8080/workflow</endpoint>
        <model>workstation-1-1.0.0</model>
        <task>1000</task>
        <event>10</event>
        <items>order.number;order.date</items>
        <debug>true</debug>
     </imixs-micro>