[PATCH] Remove property with possibly unset variable

[Wald Commits]

# HG changeset patch
# User Tom Gottfried <tom at intevation.de>
# Date 1615893567 -3600
#      Tue Mar 16 12:19:27 2021 +0100
# Branch 3.2.x
# Node ID 05e8449221489e8d1774486daaa0968002b20c46
# Parent  aef9871248220afc380575748e6322a3e7369281
Remove property with possibly unset variable

The unset variable prevented running standalone Checkstyle with this
configuration.

diff -r aef987124822 -r 05e844922148 checkstyle.xml
--- a/checkstyle.xml	Fri Mar 12 15:11:44 2021 +0100
+++ b/checkstyle.xml	Tue Mar 16 12:19:27 2021 +0100
@@ -34,8 +34,6 @@
 
   <module name="TreeWalker">
 
-    <property name="cacheFile" value="${checkstyle.cache.file}"/>
-
     <!-- required for SuppressWarningsFilter (and other Suppress* rules not used here) -->
     <!-- see http://checkstyle.sourceforge.net/config_annotation.html#SuppressWarningsHolder -->
     <module name="SuppressWarningsHolder"/>