Check to make sure that the sip_buddies table exists if the db exists, before altering it.

git-svn-id: http://wush.net/svn/range/software/public/subscriberRegistry/trunk@6574 19bc5d8c-e614-43d4-8b26-e1612bc8e597

debian/postinst

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # postinst script for test
 #
 # see: dh_installdeb(1)
@@ -39,7 +39,7 @@ fi
 chown -R root:www-data $SR_DIR
 chmod 775 $SR_DIR
 
-if [ -e $SRPATH ]; then
+if [[ -e $SRPATH && "`sqlite3 $SRPATH "PRAGMA table_info(sip_buddies)"`" != "" ]]; then
 	if [ ! -e $SR_CONFIG_BACKUP ]; then
 		sqlite3 $SRPATH ".dump" > $SR_CONFIG_BACKUP
 	fi