Build: Fix i2pcontrol unset property in manifest

apps/i2pcontrol/build.xml

@@ -93,6 +93,8 @@
     </target>
 
     <target name="jar" depends="compile">
+        <!-- set if unset -->
+        <property name="workspace.changes.tr" value="" />
         <jar destfile="build/i2pcontrol.jar" basedir="./build/obj" includes="**/*.class" >
             <manifest>
                 <attribute name="Implementation-Version" value="${full.version}" />
@@ -107,6 +109,8 @@
     </target>    
 
     <target name="socketJar" depends="compileSocketJar">
+        <!-- set if unset -->
+        <property name="workspace.changes.tr" value="" />
         <jar destfile="build/i2pcontrol.jar" basedir="./build/obj" includes="**/*.class" >
             <manifest>
                 <attribute name="Implementation-Version" value="${full.version}" />
@@ -121,6 +125,8 @@
     </target>    
 
     <target name="war" depends="compile" >
+        <!-- set if unset -->
+        <property name="workspace.changes.tr" value="" />
         <war destfile="build/jsonrpc.war" webxml="web.xml" >
             <classes dir="./build/obj" excludes="net/i2p/i2pcontrol/I2PControlController.class net/i2p/i2pcontrol/HostCheckHandler.class net/i2p/i2pcontrol/SocketController*.class" />
             <manifest>