[php-maint] Bug#724001: don't emit messages if no action required upon purge

[jidanni at jidanni.org]

Package: php5-mysqlnd

We see
Purging configuration files for php5-mysqlnd ...
php5_invoke mysqlnd postrm: No action required for apache2 SAPI
php5_invoke mysqlnd postrm: No action required for cli SAPI
php5_invoke mysqlnd postrm: No action required for cgi SAPI
php5_invoke postrm: Purging module mysql for apache2 SAPI
php5_invoke postrm: Purging module mysql for cli SAPI
php5_invoke postrm: Purging module mysql for cgi SAPI
php5_invoke postrm: Purging module mysqli for apache2 SAPI
php5_invoke postrm: Purging module mysqli for cli SAPI
php5_invoke postrm: Purging module mysqli for cgi SAPI
php5_invoke postrm: Purging module pdo_mysql for apache2 SAPI
php5_invoke postrm: Purging module pdo_mysql for cli SAPI
php5_invoke postrm: Purging module pdo_mysql for cgi SAPI
php5_invoke mysqlnd postrm: No action required for apache2 SAPI
php5_invoke mysqlnd postrm: No action required for cli SAPI
php5_invoke mysqlnd postrm: No action required for cgi SAPI
php5_invoke mysql postrm: No action required for apache2 SAPI
php5_invoke mysql postrm: No action required for cli SAPI
php5_invoke mysql postrm: No action required for cgi SAPI
php5_invoke mysqli postrm: No action required for apache2 SAPI
php5_invoke mysqli postrm: No action required for cli SAPI
php5_invoke mysqli postrm: No action required for cgi SAPI
php5_invoke pdo_mysql postrm: No action required for apache2 SAPI
php5_invoke pdo_mysql postrm: No action required for cli SAPI
php5_invoke pdo_mysql postrm: No action required for cgi SAPI
php5_invoke mysqlnd postrm: No action required for apache2 SAPI
php5_invoke mysqlnd postrm: No action required for cli SAPI
php5_invoke mysqlnd postrm: No action required for cgi SAPI
php5_invoke mysql postrm: No action required for apache2 SAPI
php5_invoke mysql postrm: No action required for cli SAPI
php5_invoke mysql postrm: No action required for cgi SAPI
php5_invoke mysqli postrm: No action required ...
well perhaps then just don't emit any messages.