Signals Notebook: Parent, Child and Self relation in searching items

Unable to search blank experiment while searching it as condition parent.

Solution: 

• For simple display mode and specifically for the Type filter field , when the filter relationship is set to self, (all types will be shown), when it is set to parent then only the child types will be shown (Chemdraw Drawing, MS Word, MS PowerPoint, Samples, tasks, Text, MS Excel, PDF, Image, Spotfire file etc.), and when it is set to child then only parent types will be shown (Notebook, Experiment, Request, admin defined objects).

In the issue described above when the experiments are selected by "created" and active state:

• When we select parent in created tab, since the experiment is blank and no content is added to it (e.g., PDF, text etc.) there is not parent information of experiment and hence it doesn't show in the results.  
• When we select self in created tab (it will show all types of files and in the results the value will be greater) and we will be able to see all type of experiments even the blank ones. 

 Also, these filter types are not similarly applicable to all key filter fields, i.e., Parent is not available for content only field filters (for example Notebook) and Child is not available for content only field filters for example Text (you can refer the below diagram for better understanding)