renderedPartially with a null value throws a NullPointerException
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                 Key: TOBAGO-507
                 URL: https://issues.apache.org/jira/browse/TOBAGO-507
             Project: MyFaces Tobago
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.0.12
         Environment: -
            Reporter: Zied Hamdi
            Priority: Minor


renderedPartially commands with a null value throws a NullPointerException

we can obtain null when we use templating.

java.lang.NullPointerException
at 
org.apache.myfaces.tobago.renderkit.html.CommandRendererHelper.initOnclick(CommandRendererHelper.java:100)
at org.apache.myfaces.tobago.renderkit.html.CommandRendererHelper 
.<init>(CommandRendererHelper.java:61)
at 
org.apache.myfaces.tobago.renderkit.html.scarborough.standard.tag.TreeOldRenderer.getTreeNodeCommandVar(TreeOldRenderer.java:292)
at 
org.apache.myfaces.tobago.renderkit.html.scarborough.standard.tag.TreeOldRenderer.createJavascript
 (TreeOldRenderer.java:251)

in       } else if (command instanceof 
org.apache.myfaces.tobago.component.UICommand
          &&  ((org.apache.myfaces.tobago.component.UICommand) 
command).getRenderedPartially().length > 0) {

we should have  } else if (command instanceof 
org.apache.myfaces.tobago.component.UICommand
          &&  ((org.apache.myfaces.tobago.component.UICommand) 
command).getRenderedPartially() != null && 
((org.apache.myfaces.tobago.component.UICommand) 
command).getRenderedPartially().length > 0) {


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