Exclude PHPMD undefined variable check

The undefined variable check of PHPMD is currently broken giving a false positives.

Author: ashokadewit

src/MediaCT/phpmd.xml

@@ -13,6 +13,7 @@
     <rule ref="rulesets/cleancode.xml">
         <exclude name="ElseExpression"/>
         <exclude name="StaticAccess"/>
+        <exclude name="UndefinedVariable"/>
     </rule>
     <rule ref="rulesets/codesize.xml"/>
     <rule ref="rulesets/design.xml"/>