Add extra NULL pointer test to ZFinderPlotter

When making the 2D histograms, only one of the vectors was checked,
allowing a second NULL vector to sometimes sneak through.
Add "No Trigger" to names of ZDefinitions

These ZDefinitions now have names distinct from the definitions they
inherit from.
Merge pull request #2 from alexeyfinkel/master

Delta-phi correction for NT electrons
Update formatting of NT Correction code

Made the following changes:
    * Used consts to make some "seemingly arbitrary" numbers clear
    * Attach braces
    * Fix indenting
Move NT Bending Correction to its own function
Further update and fix to the NT bending funciton.