All configNode setters should handle a null parent node case

[Robert Leach]

USE CASE: WHAT DO YOU WANT TO DO?

Set a config node

STEPS TO REPRODUCE AN ISSUE (OR TRIGGER A NEW FEATURE)

1. Look at Pull Request 14, DendroController, line 132

CURRENT BEHAVIOR

Null parent is not handled

EXPECTED BEHAVIOR

At least issue an error in the log

DEVELOPERS ONLY SECTION

SUGGESTED CHANGE (Pseudocode optional)

At least issue an error in the log

FILES AFFECTED (where the changes will be implemented) - developers only

various

LEVEL OF EFFORT - developers only

minor

COMMENTS

[Robert Leach]

Removing milestone: Coding Convention Adherence (automated comment)