Added further detail to the hacking file

Change-Id: I28fb8ece3accfece168982b8a5a88cc2fb3deb66
Adding GitHub skip if open issue support

Change-Id: Ib2682b66fa422f2ba5df0f85151bed676c3ea033
* fixed _set_xml_etree_element in XML_ToolsMixin
* to use the correct function, _remove_empty_values,
* from CommonToolsMixin for excluding empty properties

Change-Id: I2d72f9fbeec039dadcc52d5da8a769626fcf1444
Correcting NoneType stacktrace when trying to get json results.

It looks like someone forgot to change this. In the future, we'll
probably want to refactor and clean up this area of the code a bit.

Change-Id: I70a8c61e6c9c28f24c63b6c1b353b96e7fd9a20f
Merge "Correcting NoneType stacktrace when trying to get json results."
Merge "Adding GitHub skip if open issue support"
Merge "Added further detail to the hacking file"