Remove PMD rules for empty constructors.
Remove PMD rules for empty constructors.

Dagger requires @Inject annotated blank constructors in some
cases, which our PMD rules are complaining about.

Change-Id: I969b974c91cc5faacb6a95daabc2567322293fd3
Reviewed-on: http://gerrit.dmdirc.com/2646
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <79e2475f81a6317276bf7cbb3958b20d289b78df@dmdirc.com>

ShaneMcC/DMDirc-Client,greboid/DMDirc,ShaneMcC/DMDirc-Client,ShaneMcC/DMDirc-Client,csmith/DMDirc,greboid/DMDirc,DMDirc/DMDirc,greboid/DMDirc,csmith/DMDirc,DMDirc/DMDirc,greboid/DMDirc,DMDirc/DMDirc,ShaneMcC/DMDirc-Client,DMDirc/DMDirc,csmith/DMDirc,csmith/DMDirc