Debian: Tolerate error in systemd/clamav-daemon.service if dir already exists

install/vst-install-debian.sh

@@ -1110,8 +1110,8 @@ if [ "$clamd" = 'yes' ]; then
     fi
     chown -R clamav:clamav /var/run/clamav
     if [ -e "/lib/systemd/system/clamav-daemon.service" ]; then
-        exec_pre1='ExecStartPre=/bin/mkdir -p /var/run/clamav'
-        exec_pre2='ExecStartPre=/bin/chown -R clamav:clamav /var/run/clamav'
+        exec_pre1='ExecStartPre=-/bin/mkdir -p /var/run/clamav'
+        exec_pre2='ExecStartPre=-/bin/chown -R clamav:clamav /var/run/clamav'
         sed -i "s|\[Service\]/|[Service]\n$exec_pre1\n$exec_pre2|g" \
             /lib/systemd/system/clamav-daemon.service
         systemctl daemon-reload