ignore some phpstan findings #3

Fixing them would not improve code quality

phpstan.neon

@@ -5,6 +5,11 @@ parameters:
     stubFiles:
         - phpstan/stubs/CakePHP.stub
     ignoreErrors:
-        # False positive as __() function can accept more than 2 parameters.
         - '/Function __ invoked with [0-9_]+ parameters, 1-2 required./'
         - '/Access to an undefined property BehaviorCollection::\$Filtered./'
+        - '/Dead catch \- InvalidArgumentException is never thrown in the try block./'
+        - '/Unreachable statement \- code above always terminates./'
+        - '/Call to an undefined method Model::setFilterValues\(\)./'
+        - '/Call to an undefined method Model::getFilterValues\(\)./'
+        - '/Access to an undefined property Model::\$DocumentCategory./'
+        - '/Access to an undefined property Model::\$itemToUnset./'