show HU Transform process only for HUEditorView(s)

if the view is not HUEditorView will fail on execution anyways

#683

src/main/java/de/metas/ui/web/handlingunits/process/WEBUI_M_HU_Transform.java

@@ -190,6 +190,11 @@ public final Object getParameterDefaultValue(final IProcessDefaultParameter para
 	@Override
 	protected ProcessPreconditionsResolution checkPreconditionsApplicable()
 	{
+		if(!isHUEditorView())
+		{
+			return ProcessPreconditionsResolution.rejectWithInternalReason("not the HU view");
+		}
+
 		if (!getSelectedDocumentIds().isSingleDocumentId())
 		{
 			return ProcessPreconditionsResolution.rejectBecauseNotSingleSelection();